Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dc68f767618e569…

MALICIOUS

PDF

88.2 KB Created: 2021-09-08 23:51:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 94a7afe0db056675c01f681b0f79d790 SHA-1: 6f85d910563597e724ab6af1f9008a55b87999b4 SHA-256: 9dc68f767618e5695a616c5bf7fe7b7a4b392f8cd013ff53812f79a5e8bc7ca8
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it functions as a link farm. Multiple URLs point to external sites, some hosted on compromised CMS uploads, suggesting an attempt to lure users to malicious content or phishing pages. The PDF structure itself does not contain readable content, but the embedded links are the primary indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/656806d3c0e29934860ed0a43080c24c/satepebepurijumupu.pdf
    • http://ferrogep99.hu/static/media/file/sirimevireduma.pdf
    • https://synersys.fr/contenu/file/notubagisanap.pdf
    • http://abwingsva.com/uploads/files/86779691189.pdf
    • https://jkmart.net/FCKFiles/File/82434812666.pdf
    • http://villapellegrino.it/userfiles/files/zojutoparekokunoxufovis.pdf
    • http://smogy.ru/files/files/lubodevufigaterijeluzanu.pdf
    • https://foundryindia.org/userfiles/file/bejifivurukinejavobide.pdf
    • http://daydreamspin.com/userfiles/file/gasitewiz.pdf
    • http://klaaswester.nl/img/file/52169620369.pdf
    • https://enilubricant.hoakhanh.vn/uploads/image/files/26788748657.pdf
    • https://hunglivet.com/uploads/files/202109052302006802.pdf
    • https://sacc-la-chaux-de-fonds.ch/fichiers/file/42789819332.pdf
    • https://kitapkapla.com/upload/ckfinder/files/nazabevumosujepavonojov.pdf
    • http://kfoodntea.com/dataroom/file/82835292301.pdf
    • https://benqmusicworkshop.com/fupload/file/vokovigawaxisiwadagife.pdf
    • https://luatsuavina.com/userfiles/file/90419426064.pdf
    • http://www.rodnolespropertymanagement.com/siteuploads/editorimg/file/58818807427.pdf
    • http://qiuyutv.com/userfiles/files/20210905022911.pdf
    • http://www.sictombbi.fr/ckfinder/userfiles/files/57700404711.pdf
    • http://xn--e42bt3l.net/upfile/files/xipagojosuduxaziki.pdf
    • http://tech-in.info/bramy/userfiles/file/pejoxisizuligugira.pdf
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/14c2f0a0d20df8734a053617af2ec62e/kenusajenoxaduvuj.pdf
    • http://dekoblickfang.de/userfiles/file/lakoxurosusa.pdf
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/olttjcmi4rcoet5afauaicqs3e/69989703818.pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1fe1db08b---fudogifogimemilanine.pdf
    • http://elvirajogsi.hu/ckfinder/userfiles/files/dawujukotudijisemu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=easy+drawing+app+for+android
    • 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_off0000f3a9.bin
d82c93416ed739d4c526f204c48e2d5e4f7ac280cb59c4e96e6bcfaa50303b1b
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A9 18144 bytes
font_01_sfnt_off000122c7.bin
8e473c15423fa4d4657217e865c9b6682b23d81be6eb1c5a0e6443f5a6d42b69
pdf-font-stream PDF embedded font (sfnt) at offset 0x122C7 10580 bytes
font_02_sfnt_off00013ad3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13AD3 16792 bytes