Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0237a8caa5df767…

MALICIOUS

PDF

86.7 KB Created: 2021-07-03 11:58:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 538c601265292f6611c0db3ef1121eee SHA-1: bdd1321e6cae375df896a15b75a7088e6fef9c1c SHA-256: f0237a8caa5df76778e3aae82bb88fabcfcbc6b35aa1d9672cf88e9b8cfdf636
176 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites. These sites host further PDF files, suggesting a multi-stage attack or phishing campaign designed to trick users into downloading malicious content or providing sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608262b9d4161---1111167234.pdf
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16080ddca33afe---28232923862.pdf
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160776de7b7a67---burujutibakuparip.pdf
    • http://divorcefinance.nl/uploads//file/kisimuzosebik.pdf
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac6187473ed---22576133306.pdf
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/079e6897333a182783e898742dfc5b28/riseferurotowobigavaze.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c0af0809171---ropizemezeniji.pdf
    • http://rollfactorytogo.com/uploads/files/18700806627.pdf
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8ed04fca25ab0611213eb7d440775897/magizotomosajaxekufafa.pdf
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/soguv.pdf
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/1tahjnscil9o3vrkvsfh0tgv45/67039989411.pdf
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160787720d58c1---77990934410.pdf
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/h7p3sjulooccv8joog4vgblov0/95382885386.pdf
    • https://airflow-skateboards.com/upload/file/22464833706.pdf
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc8ad104abf---navosinipujolexanuw.pdf
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/da86aac21fc02f3e9996a62c044b8ea2/popamexubekafori.pdf
    • http://www.pavimentosyreformasferlu.es/ckfinder/userfiles/files/livorikazuses.pdf
    • http://chocoenglish.com/_UploadFile/Images/file/jelavekadutefetesitun.pdf
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/6d7dfac9e603601ff900eee9c09820f4/12517648753.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160924d8a653de---muxuvur.pdf
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/88435125945.pdf
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/2db9d8d6759ebb5d75be2961f5a17c7f/satabe.pdf
    • http://infinity-pro.ru/userfiles/file/40779531291.pdf
    • https://www.anandtirth.com/wp-content/plugins/super-forms/uploads/php/files/7rpecvo04ssbj97i6207qc4h61/godegiwitu.pdf
    • http://ticaproduce.com/ckfinder/userfiles/files/6552965391.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=tiny+pdf+for+android
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3fb.bin
a83e0691df149d0e3fc29aa117708dbbc03af38925fcb71b6019c0541880a558
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FB 16704 bytes
font_01_sfnt_off00011ef3.bin
6595b23c77bb1289a3bff0a80a9f072c259b2585ed5368f2c1d94b25cd3c2d01
pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF3 10124 bytes
font_02_sfnt_off00013597.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13597 16792 bytes