Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5181e92bc5bdb25…

MALICIOUS

PDF

69.5 KB Created: 2021-09-01 07:00:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 42a828fdb74f3929c2164f38a3deb9b2 SHA-1: c59aa48853174c7282f2b0c8236dd3ba6f135230 SHA-256: f5181e92bc5bdb2567464f600b573cc68545bdb6293edada0c67497c6e544bd8
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. The PDF_IMAGE_LURE heuristic indicates it presents as an image-only document with a clickable action, designed to deceive users. Multiple heuristics point to the document being a link farm, with many URLs hosted on compromised WordPress sites and disposable domains, suggesting an attempt to distribute malicious content or redirect to phishing pages. No scripts were extracted, but the overall structure and URL patterns strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://pdww.ru/ckfinder/userfiles/files/jemogusifibe.pdf In PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/ef5236cc2762287a8e5edc1664ceac5c/47014797767.pdfIn PDF document text
    • http://polins.org/public/userfiles/file/44912121403.pdfIn PDF document text
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/jemaxibagapegajal.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/e1fbacf5133685d239a997eb2246c9c8/85672300270.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/ngeahafq212t5jmfnmtddqoo62/litikemixuwagudu.pdfIn PDF document text
    • http://be1971.com/clients/a/a1/a19be2fc4cf8b198b52f296748481ce5/File/11495633292.pdfIn PDF document text
    • http://farmaciacogliate.it/userfiles/files/27099720280.pdfIn PDF document text
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/9c901mqi7o7k0o860ut0b43l33/fubozudotijewupege.pdfIn PDF document text
    • http://smclassof57.org/clients/34860/File/wadebevuvabifubogosodamur.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/lovojixosi.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc8c1d57a24---luvalurasitowapoluzuwosov.pdfIn PDF document text
    • https://renesens21.com/ressources/upload/files/savovilefas.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/bumojezaxebapadinasofawed.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/nukesexokonefavu.pdfIn PDF document text
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/pfnb5rad8evinnpij3cs54b3sj/80791038631.pdfIn PDF document text
    • http://www.horakgolf.cz/ckfinder/userfiles/files/kimupunofila.pdfIn PDF document text
    • http://artin-intranet.com/ckupload/files/wudifofoj.pdfIn PDF document text
    • https://telorgabus.com/contents//files/53347607591.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/pamewakiwaruzepad.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ddd656f45---dalepajifivez.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f77c1d0d0e---riruteziduvatanaxega.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/ce1f2fd0f8b1bf6822c8119a3779ed87/31743910334.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/7v140r61d2797ga3nqs8a2d60r/20087169379.pdfIn PDF document text
    • http://opuspointpartners.com/ckfinder/userfiles/files/10264812617.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=song+he%27s+a+good+good+fatherPDF 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_off0000b4ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD06 10604 bytes
SHA-256: 783c08f2bb7c789ec738c8405343ef31f66225db9f5e3fb20603fab98ff8ed2e
font_02_sfnt_off0000e511.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE511 13892 bytes
SHA-256: 9d6c462995dd855a5fd10305a152a93c1833d90e1f2c8f30a79ed31b181d4953