Malicious PDF — malware analysis report

Static analysis result for SHA-256 a01fdb4e81eb90e1…

MALICIOUS

PDF

79.1 KB Created: 2021-09-14 03:48:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ad5d16e1c0945d10a492f20d315d4103 SHA-1: d39008b700e59972d74a602409dde661ce0c7ac2 SHA-256: a01fdb4e81eb90e140a049146f97024e876f5a156d79f92a51ed7db16e4a0d27
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The document body is unreadable, but the presence of numerous URLs suggests an attempt to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://manenshop.com/upload/files/39041566772.pdf In PDF document text
    • http://xn--80aer5aza.xn----htbdepbihnfb8cyg.xn--p1ai/ckfinder/userfiles/files/rabafinesikomirebogulup.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/19090608694.pdfIn PDF document text
    • http://corporatiegids.nl/uploads/files/50831223268.pdfIn PDF document text
    • http://frankifoto.com/uploads/pages/files/15220857076.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/161383ae93958b---vapimuvokiseka.pdfIn PDF document text
    • http://www.cda.org.hk/ckfinder/userfiles/files/15632280677.pdfIn PDF document text
    • http://dorisemitchell.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rutot.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///lobodulikesi.pdfIn PDF document text
    • http://yas-center.ru/userfiles/file/52388978839.pdfIn PDF document text
    • http://aurangabadptti.com/ckeditor/ckfinder/userfiles/files/tifutos.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1613efbaabac64---4908551693.pdfIn PDF document text
    • http://kimandyoo.com/userfiles/file/10336919601.pdfIn PDF document text
    • http://www.sandipmallick.com/fckimages/file/9635238841.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/52907223142.pdfIn PDF document text
    • http://hoya889.com/upfile/files/20210904210147.pdfIn PDF document text
    • http://citranco.com/users/files/medanubexipalo.pdfIn PDF document text
    • https://venusnvs.com/userfiles/file/77779016832.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131869bccba1---25078472018.pdfIn PDF document text
    • https://hantverksakuten.se/ckfinder/userfiles/files/17862970917.pdfIn PDF document text
    • http://ibrahimalsada.com/pics/file/komale.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/jirikexopubozat.pdfIn PDF document text
    • http://conhantaoankhanh.com/webroot/img/files/jowemeziworajuvedadile.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=hide+text+notifications+androidPDF 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_off0000d0d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0D5 17964 bytes
SHA-256: 7b0f9e0ff9513606dd82fbd0553a9153e0d554dee03b0b686626da7a74c99e4e
font_01_sfnt_off0000fed3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED3 10516 bytes
SHA-256: 565ff1839d84c81bd54938e5954ce50bdab67cf7fced7e0cbd65ced619072b30
font_02_sfnt_off000116e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1