Malicious PDF — malware analysis report

Static analysis result for SHA-256 5034fa6de3f472a7…

MALICIOUS

PDF

85.9 KB Created: 2021-09-12 13:08:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 327ac373dac2a63381c33ade05717f7b SHA-1: 6a27e783229a0b133a645a0224759e49cd22754e SHA-256: 5034fa6de3f472a70dc16c80fa15a8d05d3e5400f7da3bf64a953fada39c0620
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised WordPress sites and other domains, suggesting a phishing or malware distribution scheme. The presence of multiple external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://philabc.ru/uplcv?utm_term=restrict+app+background+data PDF link annotation
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d89ecb1c99---rubevazizezodazutu.pdfIn PDF document text
    • https://cakenflowersonline.com/userfiles/file/zekenojapanuxigate.pdfIn PDF document text
    • https://premiersuli.hu/files/files/51714026408.pdfIn PDF document text
    • https://sikdercollegeofpharmacy.com/scp/ckfinder/uploads/userfiles/files/tewivutosaluzivaluzuzusag.pdfIn PDF document text
    • http://escritacontabilidade.net/fotos/news/file/xasovenonaxawajamimo.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/26087is62lqo3qa3oqigodkb23/75604565405.pdfIn PDF document text
    • http://bptramptour.pl/files/file/49611890502.pdfIn PDF document text
    • http://domgr11.ru/uploads/files/kakuvisuneputamagelurewej.pdfIn PDF document text
    • http://jiehuist.com/userfiles/files/88692451529.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d335b1b35---56261562599.pdfIn PDF document text
    • https://appchecar.com/ckfinder/userfiles/files/28465207064.pdfIn PDF document text
    • https://lyubomiradineva.com/files/file/gewanelipipekowifixuxale.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/9bd18939ef08a0332ab5b2dc879ae0d7/97599629077.pdfIn PDF document text
    • http://ck-buhgalter.ru/userfiles/file/92913736705.pdfIn PDF document text
    • http://esistore.com/userfiles/file/mujuf.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/36897657041.pdfIn PDF document text
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/78250939431.pdfIn PDF document text
    • https://unifor975.ca/userfiles/file/14478360309.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/nogik.pdfIn PDF document text
    • http://9y.bfage.com/upload/files/20210904160950.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161355a94db01f---zifijodokemedumimegoke.pdfIn PDF document text
    • https://maymac.info/userfiles/file/sewomuzimusisuribonaji.pdfIn PDF document text
    • http://grimastone.ru/files/jatezim.pdfIn PDF document text
    • https://floridagreatescape.com/media/file/tiwola.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c65c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC65C 11020 bytes
SHA-256: ad22cd7fd6b6e93b60ead65348861920bb5850c8cad1593859accb4b34c439bd
font_01_sfnt_off0000dfb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB3 22072 bytes
SHA-256: 5225a6ecaf958ad320f528031a967d90bf47cab56fc7606db13bfabfbe4821d8
font_02_sfnt_off0001176c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1176C 17292 bytes
SHA-256: 417982e4cb24d2b976a869d970d44f256d808c84c1b58659828e5abe1980fef5
font_03_sfnt_off00013149.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13149 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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