Malicious PDF — malware analysis report

Static analysis result for SHA-256 763328196cffba3c…

MALICIOUS

PDF

71.5 KB Created: 2021-09-04 21:59:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2b35bec07f984d2683a4278e48dc6950 SHA-1: 1fa086a9e8393158dedfec83fb384755796c1455 SHA-256: 763328196cffba3c2b150e40aea9a05440740878244a3be3ae69b3e1534e5518
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 and other unknown hosts. These links are likely intended to host or redirect to malicious payloads, a common tactic for phishing and malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aa61c0af737---45930243872.pdf In PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a465266d1c1---jofutokadazitaligijig.pdfIn PDF document text
    • https://gegeny.hu/uploads/file/lulalonamuloxot.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096a880c83e1---4124667018.pdfIn PDF document text
    • https://lecachet.fr/docs/files/71282915754.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0c8c7f2a7a---89169220797.pdfIn PDF document text
    • http://lamorenj.com/userfiles/file/xegifidomorojubufajefab.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/cmh0dlidh3s0tfu5o6aekql33b/182075671.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc8cd4d37b---51453228610.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/hke18o48p67k142s1kjcd0h7ie/64511990173.pdfIn PDF document text
    • http://cokhixnktientien.com/Images_upload/files/77773182721.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/7e163aa1f0d78751e90d22f6797c5f09/94391572907.pdfIn PDF document text
    • https://burgas-remonti.com/userfiles/file/tijufol.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd785b9a2d6---70758195806.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608299ccab82d---1333839088.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bc7dbe0ef1b---petuvalenovalamunogi.pdfIn PDF document text
    • http://koreanhotpot.com/uploads/files/betujesojiravemijopukiwa.pdfIn PDF document text
    • http://52963566.com/upload/file/202108120723319126.pdfIn PDF document text
    • http://thienlongadv.com/upload/files/86011212770.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/3daa575b9ac351703dc0b5b479cf14b7/5896462838.pdfIn PDF document text
    • http://it-hair.com/userfiles/fonitabezovavuxofususi.pdfIn PDF document text
    • http://konberdbio.com/upload/files/repinew.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1609bb7e542362---64948113956.pdfIn PDF document text
    • http://sibaco.ru/ckfinder/userfiles/files/58083446887.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0139645001621895168.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=chemistry+molecular+geometry+worksheetPDF 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_off0000b7cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cfe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFE2 10996 bytes
SHA-256: 08177613790de720c4623fdb1227609ca0f28a864451819527a33bd8d43778ee
font_02_sfnt_off0000e992.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE992 15196 bytes
SHA-256: 58d4b932bc44fea779118a8c762095198825e86a94fe4af6360c7c9ca0a0270a