Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca5235e9f000c057…

MALICIOUS

PDF

82.4 KB Created: 2021-09-07 11:19:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 39844e3d6c989fc99e5facc980485611 SHA-1: 744b8b7020578d6305f42cda4ce179d04f271049 SHA-256: ca5235e9f000c0573834a3000c17700a79cef1df9aa4582d4cb6d926eb011634
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://infrive.ru/uplcv?utm_term=calendrier+2019+jours+f%C3%A9ri%C3%A9s+pdf PDF link annotation
    • http://2990592.ru/ckfinder/userfiles/files/7652542326.pdfIn PDF document text
    • https://cuatudongsaigon.vn/uploads/files/72713381082.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/dbgd4sh53cm4nk2gum0gp7jvcq/25578471994.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096b8b540993---49083980876.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/wimam.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090dcab5bc0b---82475870117.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/cd81186a8e180eea126b526b752acc78/jowolizada.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160a35d98e1586---17068445979.pdfIn PDF document text
    • http://palenice.net/obrazky_clanky/file/gajinutuvurov.pdfIn PDF document text
    • https://lifo-sea.com/ckfinder/userfiles/files/nabak.pdfIn PDF document text
    • http://quaretti.it/userfiles/files/duvugevoxenigafij.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/567ecce3f484d35c1bc680da074bb13b/lebepufirezuponunijur.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1607aded2d03dc---27527296243.pdfIn PDF document text
    • https://sananselmo.com/wysiwygfiles/file/90451412091.pdfIn PDF document text
    • https://carsen.sk/editor_uploads/system/files/48774420195.pdfIn PDF document text
    • http://adimhukuk.com/resimler/files/35941224421.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/916c2caa56f998f10cbe472a5e4c4d2b/18995914781.pdfIn PDF document text
    • http://score1forspencer.com/clients/4/45/4587145e2679cb7673d0e21b436e5c25/File/39628387849.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cb34fc1dd9b---79471126171.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/54416102700.pdfIn PDF document text
    • http://ailizia.com/userfiles/sapaxikaxulusal.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609b2ff513362---70450307284.pdfIn PDF document text
    • 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_off0000d525.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD525 19752 bytes
SHA-256: ddb2c6febc6b47be4763dde05625e4141912cac4aa5781b929a4a4502333c931
font_01_sfnt_off00010748.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10748 11268 bytes
SHA-256: 30ae45fc3ff54a32102fd425f400b0dcc06839aee430bda04aba595b5356cf38
font_02_sfnt_off0001218c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1218C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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