Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2fd30c0af687979…

MALICIOUS

PDF

69.7 KB Created: 2021-09-26 14:15:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6671e26c0db57571feb921fb3cff3c68 SHA-1: 2675c6932396d2aa82f77837fd21e1ea7c41ae65 SHA-256: e2fd30c0af6879799c86cf9a95202b9edd7333ab2ca878f09659bf279df9ab01
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and link farms pointing to potentially compromised websites, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://oniceh.ru/uplcv?utm_term=tenorshare+ultdata+apk+download PDF link annotation
    • http://zdravi-kromeriz.cz/files/file/tiketatidurifowes.pdfIn PDF document text
    • http://househouse.it/userfiles/files/ripusazet.pdfIn PDF document text
    • http://xn--j1aii.su/userfiles/file/67731208161.pdfIn PDF document text
    • http://riccaassociati.eu/userfiles/files/83928642448.pdfIn PDF document text
    • https://sanipro.ma/app/webroot/uploaderfiles/wadunubalisuwazasavimog.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131dcc79d1af---gufepadenago.pdfIn PDF document text
    • https://fajndoktor.cz/images/file/files/lesunuxi.pdfIn PDF document text
    • http://metallpress.ru/files/fosuvuxasewoxo.pdfIn PDF document text
    • https://urbanlivin.lu/userfiles/files/2998738525.pdfIn PDF document text
    • https://wolfgang-photography.com/userfiles/files/73084035963.pdfIn PDF document text
    • http://ventexevent.se/uploads/file/81757317082.pdfIn PDF document text
    • http://studiodabo.eu/userfiles/files/jobiwonogupik.pdfIn PDF document text
    • http://cheapstandard.com/uploads/files/16278485005.pdfIn PDF document text
    • https://topconta.ro/userfiles/file/72403300138.pdfIn PDF document text
    • https://anitacalderon.com/ckfinder/userfiles/files/vajotokuxevaxexanu.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613375ff38ccf---79724530704.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16147a1e1c4e89---22860598844.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/16141db0573857---mazamezurubigivezo.pdfIn PDF document text
    • http://chinahk-ip.com/chinahk_ip/html/files/editor/file/lojuzegejogexidifojoniza.pdfIn PDF document text
    • https://giaphutelecom.com/tctt/sites/aaa/file/fepilevusidipovivapo.pdfIn PDF document text
    • http://suamanhinhlcd.net/userfiles/file/nefopupugiwozijezuve.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161420e5f28d81---13738328959.pdfIn PDF document text
    • http://flairpens.ru/uploads/files/80255040141.pdfIn PDF document text
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/notuxajex.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_off0000b359.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB359 10636 bytes
SHA-256: 96775ed6b5038b4c2e3484da3f658cbfabbdd5b81c55791b57da8fbf3e13efd3
font_01_sfnt_off0000cbc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBC1 14816 bytes
SHA-256: 9a2b798198aac76e505a6da663ffa829466479fd4ff00b3d3283ed11cf02b3d6
font_02_sfnt_off0000f0be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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