Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ef762e9c1e04587…

MALICIOUS

PDF

90.9 KB Created: 2021-07-03 01:17:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 8455529a2f0bcb9b5792fc16dff54fec SHA-1: f79e6e0de64935221e6ade5f46196e10f9c0912b SHA-256: 7ef762e9c1e045872d3aad34e0685e370bace591bac22cfa03b9bb7b6bfa4c1c
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing or malware distribution sites. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF designed for user redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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 http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a84cee02197---59916534961.pdf In PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160769e7234950---fikimezijasipok.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b12c76b55---pizotadodutexabivejel.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/vopusu.pdfIn PDF document text
    • http://garderoba.sk/images/_file/72958659009.pdfIn PDF document text
    • http://www.aluvascientific.com/UserFiles/file/wasuviredomijebesu.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/buzaba.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/8ntk897utga5f52a4dd60ivgom/63283164426.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/b0843df0df3163eeea468b04d7b0515c/60011375711.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b4b885d88f0ebd8f371a29add5da73e8/wunurowivilozu.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/ac3f6ae44b4cae7d22b2970c266b16d6/bobatiremete.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/05527d4aaf62f1853d633f038168b80b/vadekarurejozenivumatuno.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160818eace92ce---vileriwuvad.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/knvsvqi0t4irginerqidi3skt6/22153089634.pdfIn PDF document text
    • http://bronia.org/userfiles/file/25480894239.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160d1bc9cacb2b---powitizubupafakatoze.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/ab64647cd0807b2ffe65513567f83320/fibufoxujugogubesebo.pdfIn PDF document text
    • https://verandapattaya.com/userfiles/files/95051618545.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/vvn7ss7qhkjbbje40de3i1eos6/piwekelu.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607435168e6cd---lirubuzaravim.pdfIn PDF document text
    • http://sakem.org/userfiles/files/lotajuxutiko.pdfIn PDF document text
    • http://henca.com/files/details/file/jenupugeseridupikin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=one+sided+t+test+calculatorPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e21d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE21D 10488 bytes
SHA-256: 6675fcfef4a65b6aa2678fab35de869aa038c6d667057a6cad6ac4b05d15695d
font_01_sfnt_off0000fa1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA1B 16344 bytes
SHA-256: 5cd8a120e106fc2d4fc1855603a636a3ce922decfb1b4d98f17a4a5450337c58
font_02_sfnt_off00011014.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11014 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00012826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12826 19388 bytes
SHA-256: 8eafb2d20f128817419b374b35e9299cded2061c1297e3eee8835ff0b551a75f

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