Malicious PDF — malware analysis report

Static analysis result for SHA-256 279b29a6fd8381e7…

MALICIOUS

PDF

168.0 KB Created: 2021-06-30 13:57:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b60f55ee629dc557f2ae34aeeedfbc71 SHA-1: d90c424d683893668aaecf320a0ef58611835f09 SHA-256: 279b29a6fd8381e768c84dccb7c3fa92dbffde7116e1498e2f3c677ad5e6aaee
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable domains, likely intended to lure users into downloading further malicious content or engaging in phishing activities. The presence of multiple compromised CMS upload links and disposable hosting reinforces the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pwr-tech.ru/userfiles/file/ribowaf.pdf In PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/9d68de15993d3398543d7b69e58bf060/voluxin.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/9028026672bf78888a94a99dbb638478/19706434667.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/pamer.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/336cf1227d61e07c170d20e2f5098417/mifasulikupukef.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab854780c69---milojewe.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608566c95b3b1---88442326837.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096608f06bc0---16953729801.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160815ff38a412---tivedosudenexo.pdfIn PDF document text
    • http://ruresept.ru/files/file/kaxizeb.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/8e103f5f45f1b65b53fba7b052271518/puleruzevizesavexoxevid.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/59618260584.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/rjv7k97a31r9ddid4ffceuujtu/nimutilaziwojawomivit.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160805d68c191d---30208652307.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16071fba6ce184---34061489988.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160ace9dfd6e9c---46257121103.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160909c49b9f8b---kamoda.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16097c792a3483---11471210169.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/a4249a9abd399f4480b90a874edd886a/zawuwavakuxubulagilason.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/damowabakukitojar.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/a8c813a7df29ba7c46c829810f70a421/99892615140.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=spotted+coral+grouperPDF 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_off00023048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23048 10500 bytes
SHA-256: cdeb750d692bfd41bb0f6bfac9e87b720a1d8e64da9c4f592491e536d6bdb7af
font_01_sfnt_off00024819.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24819 18928 bytes
SHA-256: 4b291e3234ef85bb8d6e754c5252c6810c3e6640c61e7573c604c3bf058c11b3
font_02_sfnt_off000278b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x278B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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