Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c0e8a11d6f4639e…

MALICIOUS

PDF

172.9 KB Created: 2021-06-20 02:47:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: d4f81012ae0341a09786aa88c83889d9 SHA-1: 9fd61e12626f0290d68f2004258d970d0141aeea SHA-256: 8c0e8a11d6f4639ec5f27fee26ac1c99a304e97f45e08c0f3d68fb3cee29ef47
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of embedded URLs, many of which point to compromised WordPress sites or directly to IP addresses, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated and appears to contain metadata rather than user-readable content, indicating the primary malicious function is likely within the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083cd35bc723---zuliraferodewiraluwur.pdf In PDF document text
    • http://caf-ljubljana.si/docs/wiruwunediviwu.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0b8c0ce31d---famepige.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec077d7342---35929350478.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c142914392f---97345668582.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/608f1b7ac2ef3aa641de9b5444c3e750/30967323014.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/d6e131b6aa37ccd4b96454155b786d83/72048485049.pdfIn PDF document text
    • http://uptownchantilly.com/uploads/files/zapowimifojufuvirimol.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f0bd28caf---36059161824.pdfPDF link annotation
    • http://www.knickmeier.net/images/pageimg/file/gifula.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608b807708eb0---77501210011.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/vewimiwonubigabutodiv.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/40032150a372baf107796192ac0cb45f/mobifufoxusozigaz.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/12674dd50eef35ad3d7c0c2789856abd/68929137887.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/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=mahouka+koukou+no+rettousei+light+novel+onlinePDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001a07f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A07F 63480 bytes
SHA-256: 8f98f4f8b9faec8989d106305e51e9636486f6951d444f9177a0824879367d38
font_01_sfnt_off00026014.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26014 5076 bytes
SHA-256: 25a3445ac168926a0d484205f97e399ca45c7ce5a10def2433a80ba3da80d827
font_02_sfnt_off00027164.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27164 21740 bytes
SHA-256: a576370dc906de9059333ec3f18dfe560ec5650c9415a814925e6aa3a7d71b1e

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