Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2af05a343f9c18c…

MALICIOUS

PDF

84.4 KB Created: 2021-08-08 01:14:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0ef40bc3e89f8590666de87d82d16eae SHA-1: 115c5f090aefd0b9c2b2eae224a86c047b0949f9 SHA-256: c2af05a343f9c18c57f631d8085d829c3df3bb3426203235f740c4af5d43b74b
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous external links, many pointing to compromised WordPress sites and utilizing SEO-related URL parameters, suggesting a phishing or malware distribution campaign. The document body is heavily obfuscated and appears to be non-readable content, further indicating a malicious intent rather than legitimate document content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160786d32baee9---55127927391.pdf In PDF document text
    • https://dom4m.lv/userfiles/files/suxuwolusudotife.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b936de359---40874965763.pdfIn PDF document text
    • https://livres-d-art.com/ckfinder/userfiles/files/85528225263.pdfIn PDF document text
    • http://tyextractor.com/d/files/danudufod.pdfIn PDF document text
    • http://kunbot.com/upload/files/82132602076.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/dde717ed8f100a7bc4ad52d4de030930/vakositufigokoxu.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2b14924a4a---kikajalumekubuxez.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/vozalivilegivizojevejas.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16099985b9b08b---18047001361.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/b95076d7f0644c39bebf04cdfcc8ddae/kebenapodedupakumu.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-8-5/20210805043740314119.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e3bf1201a---nunutuk.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef2566dbb1---37646961402.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e7657da5504---83174738046.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/47v8qd2on5dbb6ft3kci5jel7q/91822381988.pdfIn PDF document text
    • http://korea-seals.com/ckfinder/userfiles/files/lutuloma.pdfIn PDF document text
    • http://naphotelbangkok.com/userfiles/files/67170352566.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+pass+walmart+supervisor+assessmentPDF 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_off0000e58d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE58D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9F 17488 bytes
SHA-256: aa94c67e009a96b3598ebd276a9895c933f8611186cb11bb333e15351e618518
font_02_sfnt_off00012b42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B42 10656 bytes
SHA-256: a41a977b1ce6f8504f2e2be551d3775e1583b96e567be9f54748a7300a180cec