Malicious PDF — malware analysis report

Static analysis result for SHA-256 f043cfee564a6b31…

MALICIOUS

PDF

150.3 KB Created: 2021-08-02 02:59:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 6ae04ca1e6c7ae3b4f622f83ce9963e5 SHA-1: ca39b3ccdbbf3737bece0c4a05396e77172f36cd SHA-256: f043cfee564a6b31783d35c6e44281a6f5cf827e13630aec36e935e311a0eb00
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous URLs pointing to compromised CMS upload directories, likely serving as a distribution point for further malicious content. The presence of embedded URLs and the nature of the heuristics suggest an attempt to lure users to external sites, potentially for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/964705676315338987fc544049adcc94/bezisaguropilezate.pdf In PDF document text
    • https://bwawarszawa.pl/upload/file/17590660672.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160949d1320b94---2262623624.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/17f0adfd38697bfca7347f49577bfa30/39090681259.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/qla4mkmvfch2e9230mppeejt0u/vawoz.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/f9d0fea6a133adfae042a073f44cabc3/90222727937.pdfIn PDF document text
    • http://0851gay.org/userfiles/202107file/2021070602483270554.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/g9v7eurafdofbkg7kl2llc5sjl/50540888529.pdfIn PDF document text
    • http://studiomanzella.com/userfiles/files/63880542410.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16088506350fac---26179800378.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/3768454f556c57e35a81e7d1c44e9e46/dojap.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/d5edc98457899818aaddf489caf13fd7/gesigiwemimeko.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/1815255480.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/c116dd5cf9f5b1ef7a9a1303148d1867/97666345877.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/4793b77e7bc96468f5f16a6e9c1bf462/gazamalagegivijuwowo.pdfIn PDF document text
    • http://elyriacatholic1970.com/clients/7/79/79c6984f8945646ae1b55d50a6b4dbab/File/vonap.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b834434ff7f---kemufosimanazowijupokar.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/569e613c544b58c76dc8d4e84230fd06/zugugudezitalodizoti.pdfIn PDF document text
    • http://duocthientam.com/uploads/ckfinder/files/razurumumifelumimisufi.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/6378aec7e0d38c0af1a4b0d600c24def/95077601581.pdfIn PDF document text
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/difupevupuk.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f1076f83b97---dawalapumilekozaj.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/141254351730.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=pesquisa+explicativa+segundo+gilPDF 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_off0001e440.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E440 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001fc57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FC57 11004 bytes
SHA-256: 25661d226213ccc0db47f6e572d8831827e1d74d526ff14e8fbf04eab4af3c53
font_02_sfnt_off00021590.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21590 21952 bytes
SHA-256: 4268f57ebed289886ee0576476ce86af519c0ff4ead346f1ab29c737e269db62

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