Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4ae6558e68de13c…

MALICIOUS

PDF

106.7 KB Created: 2021-10-07 16:58:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ced86e491aeb99dffc2d89cee9723c90 SHA-1: c32f67b3967de04c90815a3ae3e49d46542e14f1 SHA-256: c4ae6558e68de13c80a619a27cab69f1c2f745f8d79fe4cc4af981419404ac72
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was identified as malicious by ClamAV and an ML classifier, and it contains heuristics indicating it is an advance-fee scam lure. The document body is heavily obfuscated, but the presence of numerous external URLs, many hosted on compromised CMS platforms or disposable domains, suggests the document's primary purpose is to redirect users to malicious sites. These sites likely host further phishing content or exploit kits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://garglob.ru/uplcv?utm_term=most+expensive+koi+variety
    • http://hcvitamin.com/webroot/img/files/jubuxiwalomozejekuveji.pdf
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144247b31eb2---45042830646.pdf
    • http://study4student.com/cache/fck_files/file/jativojiforuzixumowi.pdf
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1615c5c78e0902---nufojobubaxukakivojiba.pdf
    • http://gniortho.com/files/Upload/file/muvesagagu.pdf
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134e05cb8a3b---34138432041.pdf
    • https://geloracinta.com/contents/files/52285487935.pdf
    • http://onestep-tokyo.com/userfiles/file/27742650341.pdf
    • http://pincesorvarshop.hu/editor_up/wujevomapisegebovezikux.pdf
    • http://noithatachau.vn/webroot/img/files/kikadepoboleton.pdf
    • https://0a3exp.com/upfiles/editor/files/vidufadegenulagerewiwiwiz.pdf
    • http://betriacum.madteam.net/ckfinder/userfiles/files/juxorosumofuxedugove.pdf
    • http://drivescuolaguida.it/userfiles/files/87421938750.pdf
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1615e01b70cbec---redulekutuwufovajuri.pdf
    • https://un7un9b3rl1pa7-99.com/contents/files/wofuzokuxofomamisemesa.pdf
    • http://wedooverseas.com/userfiles/file/gatexotomadafeferewiluju.pdf
    • http://baracenter.be/userfiles/file/60245855729.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/161410ab7977d6---kabebabegumetelawa.pdf
    • http://teenmag.cz/userfiles/file/vesibemobotumedijawof.pdf
    • http://baharev76.ru/userfiles/file/xokaka.pdf
    • https://justforjetscatering.com/userfiles/image/files/42275227411.pdf
    • http://poongdung.com/FileData/ckfinder/files/20210911_57A7852CF2584B55.pdf
    • http://kanalizace-ul.cz/userfiles/file/danonegasekefokexikudavo.pdf
    • https://girisimhaber.com/uploads/file/15725167244.pdf
    • 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_off000139ba.bin
35a704265f1599cdb6cfdb7d9bcd056d14b3340eda63417b963d2ff9d2d40503
pdf-font-stream PDF embedded font (sfnt) at offset 0x139BA 10568 bytes
font_01_sfnt_off00015211.bin
855881553a459019e0c107d90f4cc90e31725f2a4362ca4e640771cef25c4e6e
pdf-font-stream PDF embedded font (sfnt) at offset 0x15211 19600 bytes
font_02_sfnt_off00018507.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x18507 16792 bytes