Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7319e31e247954f…

MALICIOUS

PDF

73.2 KB Created: 2021-09-08 05:53:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 84bd61ae2996742fb55ab2442fe8f3ac SHA-1: 7a955922f00ecff86c3603d6b9b7f0b89374c595 SHA-256: f7319e31e247954f3ab4ac50a6396a2dfaff51b36d58dccd3c5e2072c8cbae7b
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to distribute further malware or phishing content. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://pension-erlkoenig.de/img/editor/file/gawizabu.pdf In PDF document text
    • http://huucodatlanh.com/userfiles/file/lerodijuxubezike.pdfIn PDF document text
    • http://saltokisport.com/uploads/files/pozunusopiveruvuromiru.pdfIn PDF document text
    • http://brickchamber.com/ckfinder/userfiles/files/11152316523.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f34aaccf3b7ef0118ed6c12ef2256b7a/37578123963.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/gifepelugaridajaka.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/57426226440.pdfIn PDF document text
    • https://bselink.com/userfiles/file/bufalivorubewej.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/28605863558.pdfIn PDF document text
    • http://textstricker.de/benutzerdateien/8811345970.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16295860534428.pdfIn PDF document text
    • http://vipforiraq.com/userfiles/files/kisoniwipebu.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9b2ccb0e9---toketerora.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160edae0e68775---71346903640.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a661208aae9---92952196395.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/torazajubarewinanogofon.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f51eb0dd8a9---tipifugegoxug.pdfIn PDF document text
    • http://sun-tes.ru/files/file/rizapinaxelibobaxufo.pdfIn PDF document text
    • http://gdwtechnology.com/fckeditor/file/40215937155.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/72586b29edddaf9e5b8ce3a0566688c0/lekexirodemiviwuxis.pdfIn PDF document text
    • http://dichvugiayphep.biz/upload/ck/files/18290309976.pdfIn PDF document text
    • http://vnos.vn/app/webroot/uploads/files/zepimif.pdfIn PDF document text
    • http://artpolyclinic.com/file/files/butakabomalixulapobul.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/28412134425.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=key+word+transformation+fce+pdf+with+answersPDF 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_off0000b987.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB987 11028 bytes
SHA-256: 2d8e6424d7ec8a08633cb3570359f8f9372c90a1191ebc180629baad26d183bb
font_01_sfnt_off0000d313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD313 17164 bytes
SHA-256: f3929884d91babba1b398ed5b0b62afa3ab3a19b819132bbc1afeef25c367aa4
font_02_sfnt_off0000feff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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