Malicious PDF — malware analysis report

Static analysis result for SHA-256 abefb6eb2fe262b5…

MALICIOUS

PDF

85.1 KB Created: 2021-08-08 22:44:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 78884b8cb64d6fe4870124a430ba242e SHA-1: c3e1bd36e627aad36993189753df12fbdb25361b SHA-256: abefb6eb2fe262b534b26013aceb822c172dc2ffde6ee320c29bc6d70b73a852
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier returned a high probability of maliciousness. Heuristics indicate the document functions as a link farm, directing users to multiple compromised websites and disposable hosting domains. These links are likely intended to facilitate phishing attacks or distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://allytemp.ru/uplcv?utm_term=comprehension+ecrite+a2+examples PDF link annotation
    • https://astek-telem.fr/userfiles/file/kokujelefudanabom.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609762c411742---96579880268.pdfIn PDF document text
    • http://www.ujepites.hu/userfiles/files/7427759254.pdfIn PDF document text
    • http://se-ty.ru/uploads/userfiles/file/giwovoxurezukumi.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16091e1074baed---losulipexezopufaga.pdfIn PDF document text
    • http://jump360.co/upload/files/20210715145811.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/maseteluf.pdfIn PDF document text
    • https://ytdrive.com/CKEdit/upload/files/nowumipube.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/peasfe08r1ep71n32asims9et1/92369568862.pdfIn PDF document text
    • http://greathorserider.com/ckfinder/userfiles/files/fukerapoxo.pdfIn PDF document text
    • https://immobilgold.com/file/nodevupitukapebuxuvuk.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc04a2c0739---19366598175.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/0f0si63boo6t2dmq67ojbd808m/53136898525.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/muziparowew.pdfIn PDF document text
    • https://peilimineko.com/userfiles/file/xidavusigamom.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608021adda1a5---rogimovividebixamone.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160960c9eb0833---difoxetil.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/84952718725.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/zasudevepu.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/b0b84bd88810d2923f522955d85ca9ed/leranofuminuxanare.pdfIn PDF document text
    • 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_off0000e670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE670 18388 bytes
SHA-256: 35bb8269317e17f66f27f31405cd93b49e7bcd8b6bbc3e6b261b6e1303b7bc32
font_01_sfnt_off0001145a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1145A 10892 bytes
SHA-256: 1c958790f8c2bf648fd358d616944ade4412a5fc53ed5ea9d5e21b26cd74bf31
font_02_sfnt_off00012d79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1