Malicious PDF — malware analysis report

Static analysis result for SHA-256 87a2421c29a29ae1…

MALICIOUS

PDF

77.3 KB Created: 2021-09-28 11:02:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d89490f2baf5d3ae2831513f69b503d2 SHA-1: 39f5460d6659a9be65c27d2f67c0ff3ccaaabac7 SHA-256: 87a2421c29a29ae17be22e215b19fa4357e37fa52979b57bb402f0a7d4952871
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The embedded URLs and the nature of the heuristics indicate a phishing or SEO poisoning attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://skvacations.com/userfiles/file/87454174657.pdf In PDF document text
    • https://aedwea.com/upload/foto/buwizuwilenixunuxuwinu.pdfIn PDF document text
    • https://vibangthuaphatlai.net/uploads/files/91472049488.pdfIn PDF document text
    • http://vstarmp.cn/upload/files/20210911_092857.pdfIn PDF document text
    • http://andersonlawdecorah.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/7061488682.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/ssdkcjl9lvp2ieum2m4osk9d74/49505394240.pdfIn PDF document text
    • http://savoie-outils-coupants.com/ckfinder/userfiles/files/vumobit.pdfIn PDF document text
    • http://csc0516.com/userfiles/file/20210903192341_kag0y3.pdfIn PDF document text
    • https://hotelite.in/userfiles/file/vuzalaniluferogifew.pdfIn PDF document text
    • https://thisissati.com/userfiles/files/jaxokoz.pdfIn PDF document text
    • http://budohurtsa.pl/userfiles/file/tovoraxozatakuguvef.pdfIn PDF document text
    • https://jdrum-music.com/uploads/ckfiles/files/20114180708.pdfIn PDF document text
    • https://kawanmto.info/contents/files/20054777636.pdfIn PDF document text
    • http://www.brickchamber.com/ckfinder/userfiles/files/tajipaza.pdfIn PDF document text
    • http://xn--c1aejbdnke.xn--p1ai/admin/ckfinder/userfiles/files/53140288740.pdfIn PDF document text
    • http://montazenabytkupraha.cz/files/file/38335531534.pdfIn PDF document text
    • http://spalovnachemolak.sk/userfiles/file/pepesejuriwifafujadifi.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/dadbc533fa6792ffdea19b5b10c1f53b/12239598781.pdfIn PDF document text
    • http://music-saikung.com/ckfinder/userfiles/files/bakoravulowigotosu.pdfIn PDF document text
    • http://onlinevay.com/upload/files/27308431093.pdfIn PDF document text
    • http://brixtontaxi.com/survey/userfiles/files/44348138700.pdfIn PDF document text
    • https://mihalex.by/files/files/xewufazigomib.pdfIn PDF document text
    • https://planningpvedh.nl/ckfinder/userfiles/files/97875682792.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/kinurijatexobav.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/s6qs6fggtmkp3j9hccms409abk/42164327140.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4bfa57f39---56538616554.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=real+player+para+android+apkPDF 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_off0000c1d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1D3 10372 bytes
SHA-256: ab45f86b0a5be07afef5fbdce8703858362a9c5318a8c38ad807bbe7ae9565f7
font_01_sfnt_off0000d94c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD94C 20532 bytes
SHA-256: 1102cae86967fd57eef717095241103738a273cf84a83ae174507f909f36623d
font_02_sfnt_off00010f2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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