Malicious PDF — malware analysis report

Static analysis result for SHA-256 aabb4b82ebe6b5ca…

MALICIOUS

PDF

71.9 KB Created: 2021-09-01 08:21:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: cf1b8372c0e75834cc108ca7d85ff743 SHA-1: 126785c6370fbb656af390c150c5f12d62daefdf SHA-256: aabb4b82ebe6b5caf41b0dc7a49a0d01d0b687e7980f52969cd9034e65079779
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://crysiq.ru/uplcv?utm_term=comfort+pdf+to+word PDF link annotation
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a06a8e777e8---19781480169.pdfIn PDF document text
    • http://24horasnoar.com.br/ckfinder/userfiles/files/84697513542.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/falelifurugileweme.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/95494368926.pdfIn PDF document text
    • http://angerdress.store/ckfinder/userfiles/files/96323870083.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/cfg6hkpqs56gmme314as0rl0nt/10477491705.pdfIn PDF document text
    • http://teormech.ru/teormech/usrimg/file/47492512282.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/102e54c1312857ba596a0cd3ee9f8226/sinoginaxonejukumowavira.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/37973592009.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16084e4162f7d7---razizilujokifakopetig.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/13730004902.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed34c41e8b---32294046047.pdfIn PDF document text
    • https://angkaganjil.com/contents/files/neduwojijewaro.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16080da51668e7---32981360711.pdfIn PDF document text
    • http://voxel-avocats.fr/uploads/file/witezizevuvolopobopedapu.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/60320874f1e8a9311c91807f5d9a1099/4902721758.pdfIn PDF document text
    • https://pnlcoach.com/misc2/file/In PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/20683361056.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/72722812316.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/e2a6eb7e35cdb58e07a0934d78a393cc/nobodazotowujevuberi.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/kugawawutoxopiba.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/63744394432.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0c4d52f056572c0f2a85c04fa69ecb93/38767963481.pdfIn PDF document text
    • http://yousefmaktabi.com/ckfinder/userfiles/files/49879720846.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/pakon.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_off0000b998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB998 10072 bytes
SHA-256: 664e5ded95004eea49f577cd387638f2691737d68cde64b580824f9ea104fe23
font_01_sfnt_off0000d00a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD00A 16620 bytes
SHA-256: a120c5a16b4d229d8c35491ce6c48aa72c18f537e12946ef80298f8fe80f710b
font_02_sfnt_off0000fa93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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