Malicious PDF — malware analysis report

Static analysis result for SHA-256 72374eb0d8119356…

MALICIOUS

PDF

74.4 KB Created: 2021-09-16 21:33:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4679fcb738741ae5a2ea20549f77c6aa SHA-1: 2372d03b320b6fdf4b56a80efbe782bf5f110eb5 SHA-256: 72374eb0d8119356ff69ae8fd0410a44fc858a8e6abadec2b466bd971fa365cb
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://ibshospitals.com/userfiles/file/86863310172.pdf In PDF document text
    • http://szerecsengyogyszertar.hu/editor_up/kisakipubofasobuvunusew.pdfIn PDF document text
    • https://taiwan-tiaya.com/upload/tiaya_official/files/13976268350.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/c3b604netp5v2m44t8misptr44/62496567425.pdfIn PDF document text
    • https://praktijk.zorglink.nl/ckfinder/userfiles/files/dagubo.pdfIn PDF document text
    • https://bdprescription.com/ci/userfiles/files/ramiwolafunewu.pdfIn PDF document text
    • https://szallas-karpatalja.com/upload/79789603392.pdfIn PDF document text
    • https://ecosolar-energy.com/piceditor/file/gopivok.pdfIn PDF document text
    • https://terminarz.online/kosmetyczka/krakow/files/zalogomakenekelok.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/talulidalawasepoju.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/musosor.pdfIn PDF document text
    • http://brenna-ski.pl/userfiles/file/ridixag.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7a4a71c1b---vabuxozavawokoru.pdfIn PDF document text
    • http://xn----itbbfrdrdbd4bgy6gi.xn--p1ai/webroot/files/files/81424179716.pdfIn PDF document text
    • https://gemwares.com/userfiles/file/10317016692.pdfIn PDF document text
    • https://maintogelonline2.org/contents/files/pugodawapefusol.pdfIn PDF document text
    • http://gdwtechnology.com/fckeditor/file/24394473347.pdfIn PDF document text
    • http://messtores.ca/fck_user_files/file/90739223292.pdfIn PDF document text
    • https://grandhotelushba.com/userfiles/file/36804574019.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/3e7b2b54db2782951561a1a836b02739/gesatukezababujidumomudep.pdfIn PDF document text
    • http://hyunbulsa.org/~ewedd2/userfiles/file/tafofodev.pdfIn PDF document text
    • https://greenlandpark.com/uploads/files/32889790448.pdfIn PDF document text
    • https://ghadir-eng.com/userfiles/files/kopunus.pdfIn PDF document text
    • https://eminenceconstruction.ca/viking1/uploads/files/vujipero.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=android+wake+on+touchPDF 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_off0000beca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBECA 17324 bytes
SHA-256: 82136890543a07adce759976c03e6ceb90b0f0296e658c2cea6354173d000f8b
font_01_sfnt_off0000ec15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001042c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1042C 10512 bytes
SHA-256: 742355a1bd5f949329e60e7dad21a1743ef64770b19f6df060d4c6f5788809d8