Malicious PDF — malware analysis report

Static analysis result for SHA-256 761fefc935251ee6…

MALICIOUS

PDF

81.7 KB Created: 2021-09-05 00:22:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9633db4e02e79f4a2be7d859e75a0d70 SHA-1: 2ffa0443c338afbfa81e0b767a08f9f35fffbb57 SHA-256: 761fefc935251ee6fda01af996c5b0f73f21867acacb10649c8debe048c2a2d3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file functions as a link farm, containing numerous URLs that point to compromised WordPress upload directories and other disposable hosting. These links likely lead to phishing pages or further malware downloads, indicating a malicious intent to lure users to compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/b58b27f59193f88b8f898de03123306f/61238851857.pdf In PDF document text
    • http://amirafouad.com/uploaded_files/file/15442599496.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/fenadorip.pdfIn PDF document text
    • https://fourseasons.events/wp-content/plugins/super-forms/uploads/php/files/9771aa58d36c4b9f9b8d6dc5cc74c96b/51877702928.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/71129287735.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/5119bb9d8c03db14024e4b742241ffab/nogowofafek.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612e4f3c904ed---71312185562.pdfIn PDF document text
    • http://strelnicebudejovice.cz/userfiles/file/41484103863.pdfIn PDF document text
    • http://challendor.com/fckeditor/upload/file/zakewomenotagasebuforokuj.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083c360072e9---85650602971.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/dac0da294106aa94ce9900a7774f926a/10854400235.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/0ee5ae0b2155c8fa2bf57f67ace3d03c/15429957289.pdfIn PDF document text
    • https://brune-schmuckwerk.de/ckfinder/userfiles/files/fuxabamafadazapexagasad.pdfIn PDF document text
    • http://sushibelovo.ru/files/kefupotizerijun.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1622091059.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/kbv4kj8ofg5v5h9ojq3jrvssc3/92404860501.pdfIn PDF document text
    • http://anthonyellisonfamilyreunion.com/clients/f/ff/ff850d76676c1858bf5e443b7a907d3b/File/dikelaru.pdfIn PDF document text
    • https://fullgame.hu/uploads/files/datinenigorodabife.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbd63693d79---80512100953.pdfIn PDF document text
    • http://opgzvh.hr/upload/file/mawarorapilevapoxipi.pdfIn PDF document text
    • http://houselandia.ru/files/rovelukinasabevufiban.pdfIn PDF document text
    • http://biolabsrl.org/userfiles/files/18884843378.pdfIn PDF document text
    • https://tectrongim.com/uploads/files/nofovatiruzozini.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=if+clause+explanation+pdfPDF 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_off0000d8d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0EB 10664 bytes
SHA-256: e96aef124aff2b198b5e9dc30ce222fccba6fd55ddade21fab6df3d42b1600ff
font_02_sfnt_off00010980.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10980 18568 bytes
SHA-256: ec384e7a3a1992ed4ef75fa813b294d77d07acd2216f4a65f42e75807d3e5925

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