Malicious PDF — malware analysis report

Static analysis result for SHA-256 1afa0e59c1596722…

MALICIOUS

PDF

70.9 KB Created: 2021-09-29 07:02:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cfc7efec719966ea68f67a3be0024764 SHA-1: 085d8d091fa4d5f202a817dac78f49ac004ef02c SHA-256: 1afa0e59c1596722b42bd7473fd9897679408c04c3adc507de0de5de0d7d6c84
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The heuristics indicate the document functions as a link farm, embedding numerous URLs that point to potentially compromised websites or disposable hosting. These links are likely intended to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://smidgel.ru/uplcv?utm_term=list+3+properties+of+an+acid
    • http://ifaistos.reality.gr/~triantaf/images/file/didobonadovemagosixutugu.pdf
    • http://thai-apsproducts.com/file_media/file_image/file/gamoxipepe.pdf
    • http://boathousebrokerage.com/userfiles/file/42964643547.pdf
    • https://hediyelikhanem.com/calisma2/files/uploads/60611825377.pdf
    • https://nwdglobal.com/ckfinder/userfiles/files/30141279805.pdf
    • http://investgeorgia.ge/userfiles/file/maxefenelofinodudezarom.pdf
    • http://www.moyekolodin.com/files/80720093664.pdf
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138c45b9d2db---14794066251.pdf
    • http://skpizzasubs.com/uploads/files/ragomorawevego.pdf
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7e4a5f462---nideba.pdf
    • https://www.canoe.ro/Extras/ckfinder/userfiles/files/vubuxikuze.pdf
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/26b7f95e09037080d5a25349ec6479ad/60365329170.pdf
    • http://murielbellhomes.com/userfiles/files/23029814283.pdf
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/1f4d7d5cf1e44299eb4e09202352f168/73583435043.pdf
    • http://one9five.com/userfiles/files/40409127559.pdf
    • http://slbreakingnews.com/ckfinder/userfiles/files/30227116408.pdf
    • https://ijp2.com/contents/files/17891003354.pdf
    • http://asorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vexedakojajaku.pdf
    • http://nomorecpapmachine.com/userfiles/files/lonuvugidowipu.pdf
    • http://teusz.pl/UserFiles/file/dujuw.pdf
    • https://impeka.lt/components/com_mijoshop/opencart/image/data/files/dotadejupiwa.pdf
    • https://arte-salon.ru/upload_picture/60776708297.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b164.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB164 16792 bytes
font_01_sfnt_off0000c97b.bin
b33f6ba05047d58a092d84ee865a3a76fd808869fb36a641f0d1d989ec4a03c5
pdf-font-stream PDF embedded font (sfnt) at offset 0xC97B 10696 bytes
font_02_sfnt_off0000e22e.bin
018c3580f6a8361a72984d75c7c252af0fa44b83a3a35a2d50710bcb84f5dee3
pdf-font-stream PDF embedded font (sfnt) at offset 0xE22E 16944 bytes