Malicious PDF — malware analysis report

Static analysis result for SHA-256 874708470cb4d040…

MALICIOUS

PDF

88.9 KB Created: 2021-09-05 07:01:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1c3a8cf54b0b3782909d709e32a34608 SHA-1: 6d74a617ea848c67c78bbc50f71a59f4308c4177 SHA-256: 874708470cb4d0401395afcbc82caf5b4a6152519e26c6ec6f01b0552c4e66c0
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of malware. The file functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting. These links likely lead to phishing pages or further malware downloads, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://huntic.ru/uplcv?utm_term=libretto+gongyo+testo+pdf PDF link annotation
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d561932ba4---99729216122.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/3b21947f5b84c2867436ec26306631f4/lomozer.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/16085d88d43d66---nazasi.pdfIn PDF document text
    • http://silverk.ru/img/lib/file/70094100944.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/denilijanozare.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079425dabb72---raxukivopidirupoduva.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c85896cdf89---gufetatubo.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/togeb.pdfIn PDF document text
    • http://amirmazandaranihospital.com/ckeditor/files/files/wabupegop.pdfIn PDF document text
    • http://status-go.net/gfx/userfiles/files/72110940786.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607c255ea5cd0---49604918523.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/31f322da01ed34517de61fd13e7060cc/66648711398.pdfIn PDF document text
    • http://kotolantopeni.cz/file/66762513524.pdfIn PDF document text
    • http://associatedreclaimed.reclaimedoils.com/userfiles/files/82154018751.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/66b0f3df2b00e02dacb4060a87c92890/tekumajeguwekoxozuxa.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/0m41a9ikp19unvci8vaabtth7q/44417292098.pdfIn PDF document text
    • https://almuhja.ps/ckfinder/userfiles/files/rezamadinuvoxilajo.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bb511729851---momixusiwelevewofufiwofi.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/20235800334.pdfIn PDF document text
    • https://ryokanclub.com/FileData/ckfinder/files/20210724_3FF1B454B944C3A1.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/78217249974.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/vukizaro.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/6849ea0c189ddf4e7caeffcdcf91c0b4/92175458870.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/u7s1q94hfdolgd8eqdof5u8ql4/48539848665.pdfIn PDF document text
    • 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_off0000f574.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF574 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D86 18480 bytes
SHA-256: 00ce152483feb41bfd6ac8811bc4c8e58c92912df27ef573efde93b520aee535
font_02_sfnt_off00013d7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D7D 10676 bytes
SHA-256: e3ded1528acc2644b81d3f89198d6c2a0201d2cfe687ab0c3324f011bfe9c775

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