Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f471c6e767f7489…

MALICIOUS

PDF

101.4 KB Created: 2021-07-05 02:03:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8063de9bf001c8f4684ad76897e4363e SHA-1: 3c179e0fd2cd6220b659b06be02f7e0bd974cd37 SHA-256: 4f471c6e767f7489e1fb1238c6cf285d3cc6de83ca84d41040db520194e77649
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to lure users to malicious content. No scripts were extracted, but the PDF structure and link farm indicate a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://iwnta.com/userfiles/file/32598788796.pdf
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16071d2bb9176b---jurakikunobim.pdf
    • https://aimara-bg.com/userfiles/file/govakokupogiva.pdf
    • http://onestudent.dk/userfiles/file/44022308192.pdf
    • https://bataretak.com/img/files/file/78179274883.pdf
    • http://pickup-ws.com/userfiles/files/41324623668.pdf
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e020cd55fd---tipakafafaxu.pdf
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/2420544d4b4e409517ae38aff07cca50/gofelukokasi.pdf
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b361673f3---tudupigobirom.pdf
    • http://maristaslardero.es/userfiles/file/sononi.pdf
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a7fefb3a28d---51151414144.pdf
    • http://badaranquehablar.com/userfiles/files/1335739002.pdf
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/96e4bde868f75ef24900052940662374/vovutapabenuzebigamala.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/1b9a74495e862ddff40a6f31bc914c74/jivaketazan.pdf
    • http://tincorner.vn/uploads/files/vusedunugar.pdf
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8c331a880446849708f05a8c3f963d9e/24176905444.pdf
    • http://vamaconsulting.sk/userfiles/file/rakekigina.pdf
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160b347eb326b2---wedul.pdf
    • http://www.sport-konyv.hu/userfiles/file/81502757275.pdf
    • http://rgn2u.com/userfiles/files/xiladidugo.pdf
    • https://marosme.ro/hirek/file/94235970867.pdf
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc0efcb503---48492402835.pdf
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/qbahun5rf4d8007pdqaqfptrsd/zorekebadarewexakoruwono.pdf
    • http://allseasonsbanquet.com/clients/868236/File/piwidi.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=tricare+select+deductible
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012aaf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12AAF 16792 bytes
font_01_sfnt_off000142c1.bin
68f2b6d91f64371bbac1584bbc517beb57954a5bb47ae6997acc109e2530c9fc
pdf-font-stream PDF embedded font (sfnt) at offset 0x142C1 17932 bytes
font_02_sfnt_off00017107.bin
ab1979fa84048bb1d7d36079aaa76132cf9954acf93ef6aa3b0804a9ff9d9e6c
pdf-font-stream PDF embedded font (sfnt) at offset 0x17107 10344 bytes