Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d89cb50c6d13f27…

MALICIOUS

PDF

72.0 KB Created: 2021-06-20 21:18:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 0c828fdae78b338910730db4020d0fe2 SHA-1: 02da4712f7cee1a30c74f2cb6237d30b3cf42994 SHA-256: 2d89cb50c6d13f271c7016d2835996d0322dcb970206b09bda550f01d26a3910
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS upload directories, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, appears to reference a 'Photoshop calendar template 2021 free', likely a pretext to drive traffic to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/6eefafca539cb0343c784da457cf1885/kixinidulusajevamixoke.pdf In PDF document text
    • https://www.truegridpaver.com/wp-content/plugins/super-forms/uploads/php/files/b5ce8c645aa96c6da7ef5c060a284e8b/45760281792.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/imqdmvj6q4skshuiu402o2cq1k/82759365946.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/4221064127.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160754793c1c3b---wozez.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file/%5C/lotifo.pdfIn PDF document text
    • http://ghioroiu.ro/sites/default/files/file/zusogakikaxawotiso.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/5b552d2578bc08156de1f4310615d645/dosotevidezotojigi.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/24499786866.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f4fdc44d2---sopiribuvufamudoni.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/88104527511.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ded59daf50---74624570308.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/depofupotabuxulil.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/73f959f5d443711a15e46fe6657ce18c/51533710643.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=photoshop+calendar+template+2021+freePDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB87 5720 bytes
SHA-256: 54f27755e2ff0c91d8b962ec7286434d3ab0a489fd1d15d296d66e110dc16e61
font_01_sfnt_off0000eedd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDD 10540 bytes
SHA-256: 92ad7103338465369504a1c2f1b2f4280105ce59996f3e086ea8d50bf4d800c2