Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1af2fea5053774d…

MALICIOUS

PDF

76.1 KB Created: 2021-09-01 01:28:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4cdab359656edd778cf304b8a52a4170 SHA-1: 2feb2299eb0664d2bea6fa71a34d5ee9f1e29c02 SHA-256: a1af2fea5053774dfbaf0f95cea72387695fd32bcd8d249cfcdc2e153c9c8df6
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to potentially compromised WordPress sites and disposable hosting domains. These links likely serve to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://sushiyaslo.com/uploads/files/97993512095.pdf In PDF document text
    • http://apex-architect.ru/images/file/ravijek.pdfIn PDF document text
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/0639aa00b6ad9f1a5c991bdafdd525a3/zesazasebevuxew.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///jamatunelirazuxisef.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/23553b0fd9d5a216184704621dd5eaeb/20893153844.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099ad0529999---99080711831.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/23501700924.pdfIn PDF document text
    • https://begili.com/uploads/image/files/fobaniboxiromevipidukej.pdfIn PDF document text
    • http://istanbulballoons.com/ckfinder/userfiles/files/27796477645.pdfIn PDF document text
    • http://laplacedesstores.com/upload/file/73769542117.pdfIn PDF document text
    • http://waukeganeast1980.com/clients/877304/File/jorin.pdfIn PDF document text
    • http://uniondrygoods.com/fckeditor/userfiles/file/93337270065.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/e8a24e449ce9287126fe572a2de52cf1/razatetonunobediwo.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/43998995478.pdfIn PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/mobananizip.pdfIn PDF document text
    • http://0965818789.com/CKEdit/upload/files/linumez.pdfIn PDF document text
    • http://jocoseatee.com/userfiles/files/wazomizeforofepufebojek.pdfIn PDF document text
    • https://bruceleevideos.org/images/file/lamak.pdfIn PDF document text
    • http://aromaonly1.com/yamituki-n/uploads/files/50931079508.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/af3d6e91876288ad276e1add61dcf57e/gekowuborikuk.pdfIn PDF document text
    • http://thanhcongtechtra.com/upload/files/wenafol.pdfIn PDF document text
    • https://asiahijau.com/contents//files/27889367240.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=knowing+brother+eng+sub+super+mPDF 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_off0000bda0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDA0 10808 bytes
SHA-256: dc5232c650829a729776163c50887f8e07f224742c63d69f01840e727b2f179e
font_01_sfnt_off0000d63c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD63C 19784 bytes
SHA-256: ae35be9c8f2303f08625676eefd93f859e8cd373b00d30c120ca9265c104205b
font_02_sfnt_off00010a6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1