Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dff4525775322f0…

MALICIOUS

PDF

87.4 KB Created: 2021-06-29 00:10:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a0916be080ab01fd27bc36746caef1a6 SHA-1: 3763e787d6ac0712e6ca2ea0d0ad7d1d201c1ecd SHA-256: 1dff4525775322f0792e8a5fc2b9d897e4d89949ca1ef2b0b9cde3acb7555d2a
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution scheme. The document body was unreadable, but the presence of numerous unknown URLs associated with compromised CMS uploads strongly supports the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16087b061c9f3c---wofimejutovovabojo.pdf In PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/9265dccaffa7357ddebe1e6840d31cd3/joxefasizimojafozepatatop.pdfIn PDF document text
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/75607475281.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/dufimivesanis.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16091bc52a187b---56082184950.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/4d9c102515b3454c90eadddd14a6588a/93725764488.pdfIn PDF document text
    • http://bazis-expertiza.ru/ckfinder/core/connector/php/files/60416900426.pdfIn PDF document text
    • https://rinducm1.com/contents//files/75704760447.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/vewipobetukojawubolobokig.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/jh4k0o6hqo7aheh4ea0vdpbsk2/97823505011.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/b1610e4fbe6967c6dbefb58afc65732d/xuxofomabefidiwadire.pdfIn PDF document text
    • http://bukharasuwanee.com/sites/default/files/file/givewedesisagidivari.pdfIn PDF document text
    • http://hutergroup.de/userfiles/file/niwajaponulanivexu.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/615200e0d644853fe0ed5376229cc4cb/16864077497.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160801c3ed221b---40630362370.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0d2921f78---rojewubigebizetotamojog.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a8f638306b---jasijuvugemuxuseniga.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160a9f9675b2e0---lugekijege.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/73ace5359cdeb1ac3fcb30ffe8f44e6c/6513985873.pdfIn PDF document text
    • http://hydrem.ru/images/file/mikiwususu.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/4d3207b3a014f260c43d93afa647e03c/72511895816.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160730b4b5c4c9---21364740039.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=of+mice+and+men+summary+chapter+6PDF 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_off0000f311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF311 16668 bytes
SHA-256: bff21cf7d99c7e7293a2728f858034414c4d199796893a4c31287291a4673833
font_01_sfnt_off00011e39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013650.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13650 11124 bytes
SHA-256: 38c47e1a849ea31a235df7532f99cc6a1db702abfade1eb3ef3bba3b4e974125

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