Malicious PDF — malware analysis report

Static analysis result for SHA-256 351efb8e86fcf1f4…

MALICIOUS

PDF

73.7 KB Created: 2021-09-16 22:31:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ae2deda2c0d772094cda25f4b294dcfb SHA-1: 58a7d1fc3d031d8c0877cdd09a022f7e654fe27a SHA-256: 351efb8e86fcf1f44b1c721af173c2e75884d9f09ec9218a7e6a527df786231b
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to domains identified as disposable or potentially compromised. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or directing users to malicious content. No scripts were extracted, but the link farm structure itself is the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://marinaxaraes.com.br/ckfinder/userfiles/files/12917044124.pdf
    • http://dfanchem.com/upload/files/lokomutijirewi.pdf
    • https://www.twibiotech.com/plugin/ce1/ckfinder/userfiles/files/zatelaperipowemej.pdf
    • http://hermandadperdon.es/userfiles/file/22479976116.pdf
    • http://hasdeu.md/data/userfiles/files/mumogajezimeto.pdf
    • https://birsamundapark.in/userfiles/files/nalagapip.pdf
    • http://vaynhe.com/upload/files/mugukosubebodikexigolawa.pdf
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff7acd76ea---96761597507.pdf
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/3f95258e437d23fef9f50a9a52145631/wafijinomitejuxomuwi.pdf
    • https://hexema.com/FCKeditor/file/69733110777.pdf
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/7efb4c2505136cd48ec890ab119b25b8/24135696656.pdf
    • http://netmutum.com/userfiles/file/foguruz.pdf
    • https://costarica4d.com/contents/files/80579354859.pdf
    • http://cn-daomeng.com/upload/userfiles/files/87c7a5a8acb8258cfc09232af651729d.pdf
    • http://www.coverseg.com/uploads/ckfinder/files/zexera.pdf
    • http://viviapalermo.com/userfiles/files/30746974592.pdf
    • https://tezerwatch.com/file/upload/files/09-09-08-49-06-55.pdf
    • https://www.benkorner.nl/admin/library/ckfinder/userfiles/files/61492078396.pdf
    • http://elitakhealing.com/ckfinder/userfiles/files/16088562791.pdf
    • https://eventpro-kontraktorpameran.com/uploaded/files/39263573645.pdf
    • https://dampinggame.com/calisma2/files/uploads/59939653526.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=ben+10+game+download+for+ppsspp
    • 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_off0000be64.bin
d1b22a97f9f41dea21c58c0443c126bd02e6fa71f48de344abe0c31d3939d35e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBE64 10964 bytes
font_01_sfnt_off0000d7bd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD7BD 16792 bytes
font_02_sfnt_off0000efcf.bin
db3141e0e6000e6a7a3725da1a40ea7945a47069be6783b3e187bce420dce378		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCF 16180 bytes

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