Malicious PDF — malware analysis report

Static analysis result for SHA-256 22d730a95d226ae2…

MALICIOUS

PDF

90.1 KB Created: 2021-07-04 13:44:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 71bcf43962e133b084a6c976656be2ec SHA-1: ea0ddf135d26088be8f192b6c09eca08545bf5b3 SHA-256: 22d730a95d226ae2bfb48a87295419ca74bf925b3f66d662fcfce7cda6c9e98f
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious content. No scripts were extracted, but the structure and heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://fanaf.comarticle_ressources/file/62563239182.pdf In PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfc4b3c296---lolevafadikuranigujerawak.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607132bcc5ad8---gejawowidofowotaro.pdfIn PDF document text
    • https://olivier-daulte.com/ckfinder/userfiles/files/razodimax.pdfIn PDF document text
    • https://hmanagement.net/userfiles/file/xopibuwudezujosakon.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160755be4ba65d---22573809841.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/napekumomafunanam.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9a411bd9f---32789301606.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609adb2bccae0---julup.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/noeg8a6qcdjf10okn94krn3d55/fegupa.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/747a2c01d5a671a9aa72916926c2c957/36935291615.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/67664763882.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/nokiputileleriwexawesixef.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ad0b051763e---71876455757.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076a6ad74f63---wofoja.pdfIn PDF document text
    • https://synersys.fr/contenu/file/72121545622.pdfIn PDF document text
    • https://aneri12.cz/res/file/15631950076.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/6u5l7l2jgufd6i5ljp95m720eo/biwefowelabowebaka.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/nasoriwepixiviwuxo.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd9fc94713---fetilubesaxarunarikalolef.pdfIn PDF document text
    • http://salondebellezaanamariaromero.es//ckfinder/userfiles/files/nujonog.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/83741101587.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/l6u7vfioc0ukoeb110ifbm3cm5/41660206844.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/tumudomugipesuvafeninapo.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/9dfff1affea7ca6a36e7d57b7675e534/tesiwatofumisoxedagamut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+say+my+birthday+is+in+spanishPDF 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_off0000f91a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF91A 10808 bytes
SHA-256: ed9e87d3c7c894baa8f7e1f2d71828ed57de910801c584fd356da48fb5465652
font_01_sfnt_off0001119e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1119E 18992 bytes
SHA-256: e76882eefda1b48fb9b33acbbcc39458d43498205b6cedab740ebf5e2289e535
font_02_sfnt_off000142c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1