Malicious PDF — malware analysis report

Static analysis result for SHA-256 9610db1ec2eb55a3…

MALICIOUS

PDF

88.7 KB Created: 2021-08-23 12:44:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 974cf2a92d0ab22537db434be6e4b7e2 SHA-1: adc39532b99aa39dd947c1b98cff3b4e4e315986 SHA-256: 9610db1ec2eb55a311b2c766f1b7fffdd6ed25ed213ac95bacc499d1d2413361
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16083051bc0827---91066237965.pdf In PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b0b969ba4---favutipafapevunaw.pdfIn PDF document text
    • http://wo-kop.pl/userfiles/file/mesij.pdfIn PDF document text
    • http://xn-----6kcaheblih5ab0a6afqbzoqe.xn--p1ai/ckfinder/userfiles/files/nukoke.pdfIn PDF document text
    • https://taxiparga.com/wp-content/plugins/super-forms/uploads/php/files/40bb4fdc918411c563287f3f1fb338c4/62975372330.pdfIn PDF document text
    • https://hoalavender.net/upload/files/57534636371.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/93610205752.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/1saakj3ohps6ppcrcs26p2qhp1/zepivixurakurotun.pdfIn PDF document text
    • http://bjqyms.com/filespath/files/20210808181306.pdfIn PDF document text
    • https://patriciobanados.cl/upload/file/In PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/e39cb0c414c79564e4f1776507884877/40858103326.pdfIn PDF document text
    • http://manvilastrust-org.bvirani.com/ckfinder/userfiles/files/46457626923.pdfIn PDF document text
    • https://novzelandiya.ru/ckfinder/userfiles/files/50119425109.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/d9f39c74fc4e44550dc5d6ab40bec5db/95905528297.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b906d2914---67812976536.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/0c4d66e03479a6b601b1ab9689525437/66699399254.pdfIn PDF document text
    • http://websteravelandscaping.com/editorData/file/pebugaxuxopokijimaz.pdfIn PDF document text
    • http://geonatlife.es//ckfinder/userfiles/files/67162574855.pdfIn PDF document text
    • http://topimmigrationlawyer.org/ckfinder/userfiles/files/60291327909.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/81409d3899824f5022cd07d0703194e3/80588586686.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/nukemizilizoberufonuf.pdfIn PDF document text
    • http://wwm-quanta.com/upload/files/57657642532.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=amsonia+flower+meaningPDF 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_off0000fac5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC5 16452 bytes
SHA-256: a72e1f1f3ad4ab02bbc5e4f13dd92035c6ff7d090f38074e789c397d08153706
font_01_sfnt_off0001256c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1256C 10524 bytes
SHA-256: b753d0e5cbead92da793c02b85048561dcf1c3d8c2fd315da66730028f42f815
font_02_sfnt_off00013d6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1