Malicious PDF — malware analysis report

Static analysis result for SHA-256 93ff25870f11b48f…

MALICIOUS

PDF

89.3 KB Created: 2021-09-06 14:11:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 45402bc228bc13a617c25e93ef3225d7 SHA-1: ca87b5291478a9209d597c4f5096eb7ded0fc9ad SHA-256: 93ff25870f11b48ffb75a4e9308b1817d813702cb0737bc38c007865356c75cf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised websites hosted on WordPress installations. These links are likely intended to facilitate phishing attacks or distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ba36671e5ee---68257085715.pdf In PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/525316363ebb3523723d3c151cc07fe2/51061445750.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/fetexodarepegamupidoluje.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a72fd31aefd---71288157894.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081debb12652---4978593575.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/faxofonepasebumala.pdfIn PDF document text
    • http://uptownherndon.com/uploads/files/zixinojowomegogumebifusi.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/c9c42f156fe60d5548a95e5852fe3161/dutaziwazofexukadavofoto.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/i6evm8rpf87gdb0j0c8acrud4g/tejabumagilafuzu.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d110984c3---javodizixamapeg.pdfIn PDF document text
    • https://kaplaitalia.it/userfiles/files/90899646269.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/67801718664.pdfIn PDF document text
    • http://www.predia.cz/userfiles/file/gesekik.pdfIn PDF document text
    • http://keitbg.com/images/files/gufufirakazoduk.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/5oio9fgkrqenf6lhn3ln0rftbl/10763094915.pdfIn PDF document text
    • https://cahayamimpi1.com/contents/files/83587156324.pdfIn PDF document text
    • http://njbeihang.com/uploadfile/file///2021082804202443.pdfIn PDF document text
    • https://cfi-registration.org/buzzboxgift/img/userfiles/files/mitenipamilelubumox.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1626380918.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608253b7477a2---12813796396.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/8bec3ffa13b083841bde82d68511ed4a/timuke.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/52167910688.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160892ffd67ce3---ruxak.pdfIn PDF document text
    • http://nmglyxx.com/userfiles/file/22980674472.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/12048038851.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=drug+food+interaction+examples+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_off0000f8b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B9 17328 bytes
SHA-256: 6de2f907307ec8308f5724a853c386ebefe8f875a3e14152deecf9f0066840f4
font_01_sfnt_off0001259a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1259A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013db1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DB1 11168 bytes
SHA-256: 2701fd8595c3f0ef55c39ece2a13ae3ad46a339102b18e5b8a29319580c8ca20

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