Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1219f21ad137015…

MALICIOUS

PDF

77.9 KB Created: 2021-06-27 08:51:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 410660f66b44c7973253eb1f0daabdda SHA-1: 20db22fe2cb79f945ae11231d7b7a41d148646f1 SHA-256: a1219f21ad137015a17237b249c58c5c24083ca92dd1312758e33df843e2f24e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating it likely exploits a vulnerability to execute code. It functions as a link farm, directing users to numerous compromised websites hosting further malicious PDFs, suggesting a phishing or malware distribution campaign. The URLs point to compromised WordPress installations, a common tactic for hosting malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/0ceb22291e2fdca84e81e3e96f17b987/rijev.pdf In PDF document text
    • http://bindashnews.com/userfiles/file/fasarimapubuvikumutaxaniw.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/050e6cfd0b832df46975799a20696f35/43498198909.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/9ue483n3gucfat3042r54kki20/nusujoxavuraniwinijexo.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609e6c6261a94---lagagixizoxubanarevuseva.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210504045203667973299.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160772a32cf51d---39861043092.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/53362387357.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/7917d0ccb3e6a2e7fbd7ebedac451be7/bivoxugibomiradudaxogujiz.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/dp82dj5i0nh61brnl3u958q7vv/42463993838.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ccfc4423dd2---bokavoriwojojizoweku.pdfIn PDF document text
    • https://fotojursa.cz/userfiles/file/negepataperevozudodosapiv.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/l3det373kekvjoeun0gnrlaokc/rurozawesur.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/16078114e91fe2---59007743482.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/fc1e2039a22364b77509fd4871b024d0/sowenirimewi.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/231fadfc53dbb368e717dfcd3e3753bf/14882891770.pdfIn PDF document text
    • http://nguyenquangcomputer.com/upload/ck/files/serimatomokewodidebofa.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a28485c001a---xexefakavakep.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/5lb0qt7q0n7i380gvq9rjhvuib/41058724395.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/i7kd6itrcc9olp3po593cgkrl2/85977304134.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/rpqbttc3dbisci3hek8g1nkn23/76512834837.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d35c8cc64---41106233968.pdfIn PDF document text
    • http://chrisdepanneservices.fr/Sites/cds/files/juteraxonizubazeza.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/ufajnmliogspcvpuu6i0jt6nj2/mewovivegidid.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/0f66038ee7d30519a0968e081b2cac04/18247429806.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6981bcf2b9---93862410917.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/lofolonapelagipozivexiduw.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4c62463ec---73783100379.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=learn+to+fly+unblocked+3PDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE33 16528 bytes
SHA-256: 409c7af1d1dc713ccc59c0e7948f6b8e111ead719557975fd70034f701b72e29
font_01_sfnt_off0000f93a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF93A 10784 bytes
SHA-256: 3bc4b40e99a0038f9352986acf36d7bd16f4a25a3face4753821ebdcdd9d205a
font_02_sfnt_off00011249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11249 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1