Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d6f21abedc1c003…

MALICIOUS

PDF

109.2 KB Created: 2021-09-08 05:28:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fc221c93caf09b4d1e4a8d79bf8fd9f3 SHA-1: ab8f0944db4174c2fb7949ca0424b4c650a4cbc1 SHA-256: 8d6f21abedc1c003209948880a67138b557f772bfbd8154cf9709837761f53b4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting, likely intended to lure users into phishing scams or malware downloads. While no scripts were directly extracted, the PDF structure and heuristic firings suggest it is designed to exploit user interaction through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9881

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://pincailight.com/zk/UploadFile/file/2021070409571973499.pdf In PDF document text
    • https://sacc-la-chaux-de-fonds.ch/fichiers/file/47311242171.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021051007182773499.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/1651503e51df2b10585d3c2ae705f5bc/gapurobebina.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b8545f624---29354305654.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/lopofuzaxafuwe.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16078569556a92---voxuropenezepimejemuxefi.pdfIn PDF document text
    • http://studiofapas.it/userfiles/files/54691333624.pdfIn PDF document text
    • http://szjwwj.com/userfiles/file///18993006904.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/93665e510334ca4e605a8a3dd3c4432e/53662581629.pdfIn PDF document text
    • http://nmglyxx.com/userfiles/file/57957293839.pdfIn PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/podesepomegoj.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/i6m3tqqt3ksresfm9b453511d4/ditimamabogirenamuvukan.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/h9astcklo6g518au630qo56725/24520527568.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/830040896.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610ea9fdace13---xowiketebasexelagetof.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098c56010b69---33674612764.pdfIn PDF document text
    • http://spamsmsgiare.com/media/ftp/file/92024923748.pdfIn PDF document text
    • https://machnik.net/ckfinder/userfiles/files/56792333028.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/81693323350.pdfIn PDF document text
    • http://dpsszczytno.pl/photo/file/66421206348.pdfIn PDF document text
    • https://jss-moms.si/upload/File/nuwalajakoto.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///lozepuvebalelirosexi.pdfIn PDF document text
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/60869719612.pdfIn PDF document text
    • https://wasael.com/userfiles/file/negivulunuzu.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/6q6kscqlo6a1me6d57eila5440/jipigaborojezobiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=analogue+and+digital+communication+techniques+pdfPDF 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_off00014084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14084 20188 bytes
SHA-256: baf0b6865f5199afe97d1f6df967ec9aaadf90a8faf2717015c70f30614916c0
font_01_sfnt_off000174f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x174F2 11196 bytes
SHA-256: 0cfd95b2ad4fb68335ad5858ef32674562e3a41bd31895633580fc161650385a
font_02_sfnt_off00018e78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18E78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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