Malicious PDF — malware analysis report

Static analysis result for SHA-256 9db6a52e10e5acac…

MALICIOUS

PDF

86.0 KB Created: 2021-08-25 00:09:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1910a99976476857beec9471e3050a83 SHA-1: 3c53137dd48fbad961e0305b155e5f35ce523d4a SHA-256: 9db6a52e10e5acac9f46149ba27587628048fd186598d8cdc86aa80d48471e21
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous links pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of external URIs and the overall structure point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://rubensova16.cz/files/file/88965887737.pdf In PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bbee464ae43---95492175548.pdfIn PDF document text
    • https://permargi.com/files/galeria/files/69137060264.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/sisalawonajawefu.pdfIn PDF document text
    • https://atl-50.com/files/file/zubogum.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/76708123353.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073dbf32a0fc---kerujasoxi.pdfIn PDF document text
    • https://mobiligennari.com/userfiles/file/13293966053.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/76252633736.pdfIn PDF document text
    • https://digireg.es/upload/netogufowavuziz.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9132320bfa---72367670869.pdfIn PDF document text
    • http://recviem.ru/img/upload/xumosagujapoguvivip.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/rebevuvonaporisadotifi.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606c898ed2ae2---zajovuma.pdfIn PDF document text
    • http://tandartsindex.nl/images/uploads/kikexomebefosuv.pdfIn PDF document text
    • http://cctsw.net/whly/up_files/FCK/file/20210820_180114_182.pdfIn PDF document text
    • http://xahscw.com/userfiles/file/33295070574.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/4cbf2821478f53cb5727f086a5e7edf2/56912060224.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607dffe2e44ea---22132086815.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/78d6b7cb78c7b99e2fc41e9c1fd92245/54784840804.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16113157b4dba7---86705558094.pdfIn PDF document text
    • http://mixmarketing.vn/upload/fck/file/kenalada.pdfIn PDF document text
    • https://ystechpro.com/nbloom/fckuploads/file/sekulelogezogakomekitab.pdfIn PDF document text
    • https://duocvinhkim.com/userfiles/file/mubenezesemawu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=highest+points+in+ohioPDF 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_off0000ef75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010787.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10787 16688 bytes
SHA-256: 817e3758d6424af8cf2cab11e7cc1ae0edb7f35f4e1855b39b1c6fd251a71ffb
font_02_sfnt_off0001331b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1331B 10216 bytes
SHA-256: 77f56345859fa819de44c6c5868a79b6705ab8eac5a730331a9a918de58b54a9

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