Malicious PDF — malware analysis report

Static analysis result for SHA-256 53113f04e1b3baff…

MALICIOUS

PDF

91.5 KB Created: 2021-07-03 12:57:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 01d913daea704296c60f6b53e5d8ba45 SHA-1: ece71b0118fb925c5287d80e3f1f31795e0426fa SHA-256: 53113f04e1b3baff7b0cd63145380ea2657da6a56c93e5686ee488aba514f176
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised websites, suggesting it's part of a link farm designed to redirect users to malicious content. The PDF structure and link farm heuristics point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9876

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://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/94cc7e14aa85ba7c47df6548af40d5b8/wefugugozolap.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160856b9263a36---47272562462.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/pe6t34ttp7jdpq42je83v9iib1/58391384334.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/lutatemerunetesiwotamul.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff8889f9b8---kogukudojedibewo.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/d05ee625f5ab6bd2a8d363fe15b0e0dd/jibel.pdfIn PDF document text
    • https://kham.vn/userfiles/file/menoxonemuzafakor.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/fe4e63ce52aac7fc7823babd18b23573/giziduzifitelopeginobaniz.pdfIn PDF document text
    • http://mesterek.net/tmp/movalujow.pdfIn PDF document text
    • http://turnyras.lt/Files/file/81544676172.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16094d8cea4372---48522262140.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160b0e11a4327d---funejobizidejumunijozabe.pdfIn PDF document text
    • http://magendans.com/imagefiles/file/80415411036.pdfIn PDF document text
    • http://xn--o79av69abka850ab6c.com/upload/file/202106300522263234.pdfIn PDF document text
    • http://dahchen.tw/userfiles/file/bibuwoduxe.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/023d6a7ca40738cefbfb559fb0fd0291/19089925915.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//49325601893.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/a8339db586135616cfa7958aeacebed3/57910231819.pdfIn PDF document text
    • http://10glazsikeyrosa.ru/file/dajowuxax.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/raketurasaz.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/mamopifudelubipu.pdfIn PDF document text
    • https://hanahana.vn/media/ftp/file/36719403253.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df41d06935b---54934618790.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/eq8otgf2r2uf8ioov003d4qvu6/dimiwovifabixipasowoselu.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078adc90cae7---81227439154.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=electron+withdrawing+substituentsPDF 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://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_off0001064c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1064C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011e63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E63 10956 bytes
SHA-256: 08b2a4c6b504435e5ace9ba8c5b027db72e7b299d96effae0ad0ff9a259da90e
font_02_sfnt_off0001378e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1378E 18116 bytes
SHA-256: 751d538e4c93b52ce77282954183269f2068316ea1accda85ab50ae03f5934ee

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