Malicious PDF — malware analysis report

Static analysis result for SHA-256 a75ada477c2499c3…

MALICIOUS

PDF

74.6 KB Created: 2021-09-20 13:19:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9cef6f032b67bf89b5c2e27ead69aee5 SHA-1: 8f9da03722c4270cb917f4fb1b8e6d708b3a6a90 SHA-256: a75ada477c2499c323375b5c7e24ed010446b125982ba4d2ba90245facbc4cf1
164 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple disposable domains and compromised WordPress sites, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of urgency lures further supports a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://crewmak.ru/uplcv?utm_term=jiosaavn+app+pro+apk PDF link annotation
    • https://bosgo.mn/uploads/files/tobidijoboganusunisoxal.pdfIn PDF document text
    • http://griesvoegwerken.nl/UserFiles/file/vukovotezemadafot.pdfIn PDF document text
    • http://fvv-hohenfelde.de/sites/default/files/files/79500536025.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb021cd79b---42755869285.pdfIn PDF document text
    • http://www.vegagastro.pl/upload/file/63647951231.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd891c5f42---lajejorudutadodilo.pdfIn PDF document text
    • https://groupburuemas2.com/contents/files/gavenibaxibefazevona.pdfIn PDF document text
    • http://unesco-mediain.cz/fckfiles/file/joritazonavefek.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/14512109911.pdfIn PDF document text
    • https://jagamimpi.com/contents/files/sabadufufovi.pdfIn PDF document text
    • http://pretaporter-pegah.com/userfiles/file/nujutipuwexep.pdfIn PDF document text
    • https://medius.sk/userfiles/file/lotagevudanijokalurixure.pdfIn PDF document text
    • http://hoachattn.com/image/files/68912775593.pdfIn PDF document text
    • https://31app.com/userfiles/file/91818748540.pdfIn PDF document text
    • https://businesslife.com/content/files/70670758291.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/50457919902.pdfIn PDF document text
    • http://vitalbafitnessclub.eu/userfiles/files/nifipe.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/fbp708qo505jus91f76lh3qvr0/favuvapevulip.pdfIn PDF document text
    • https://ambient-interier.cz/files/files/52894289260.pdfIn PDF document text
    • http://primethailand.com/ckfinder/userfiles/files/94900464266.pdfIn PDF document text
    • https://vanrun-it.nl/userfiles/files/59454365691.pdfIn PDF document text
    • http://tropo-design.com/ckfinder/userfiles/files/notumuxodemelasuvitodakar.pdfIn PDF document text
    • http://elateridae.com/images/FCKeditor/file/xobutawobunifabonel.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/a10a5a460a7020f6763d8da0c6604d45/40845889870.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_off0000c214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC214 16400 bytes
SHA-256: 29dab9adef30cc004e9c30cc8389fa6f879dad9b424d67db97a6c50c282d9e0e
font_01_sfnt_off0000ec1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010434.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10434 10120 bytes
SHA-256: fd9234be3fce09eb43d206b5e177579b3077a61c74001cfa304e44cb3406d63c

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