Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5c491b033dd2ec6…

MALICIOUS

PDF

85.8 KB Created: 2021-09-11 23:13:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b612a8cfb14b3ad2a5b783b5cdb21c62 SHA-1: 9dccee508f0567bee4ff608bf3eb050b38f55563 SHA-256: d5c491b033dd2ec69e75f271c42ade5025dabcd84db6182df66cb90e72573dea
204 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious. The 'SE_CLICKFIX' heuristic indicates social engineering, instructing the user to press Win+R or paste a command, which is a common technique to bypass macro restrictions and execute arbitrary code. The document also contains numerous links to external sites, some of which are hosted on disposable domains or compromised CMS uploads, suggesting it's part of a phishing or malware distribution workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://oniceh.ru/uplcv?utm_term=how+to+backup+skype+chat+history+on+android+phone PDF link annotation
    • https://5uempat.com/contents/files/1232488860.pdfIn PDF document text
    • http://cukrarska-vyroba.cz/UserFiles/File/fumuzulilotumogalomegemig.pdfIn PDF document text
    • http://fizjoactiv.eu/Upload/file/nomige.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/63b5d69700b7b7f892219cd436c0175a/waponemagezipodidop.pdfIn PDF document text
    • http://philipwillettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rubire.pdfIn PDF document text
    • https://www.borzabadi.com/ckfinder/userfiles/files/3424948498.pdfIn PDF document text
    • http://africareview.in/userfiles/file/33713966706.pdfIn PDF document text
    • http://zssadkowice.pl/pliki/bokoxiparadeguxotat.pdfIn PDF document text
    • https://digireg.org/upload/tivimelalurowim.pdfIn PDF document text
    • http://tsrmvolontari.it/userfiles/files/kojidusizo.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1612eacffea6eb---87624066873.pdfIn PDF document text
    • https://edarky.net/data/file/71874454647.pdfIn PDF document text
    • http://chrisdepanneservices.com/Sites/cds/files/59106704772.pdfIn PDF document text
    • http://gmkms.net/upfile_editor/2021/files/79232333670.pdfIn PDF document text
    • http://ubestsports.com/imager/files/20210908042801.pdfIn PDF document text
    • http://dsagco.com/Upload/file/92865711517.pdfIn PDF document text
    • http://tlumacz-francuskiego.pl/userfiles/file/pusiwudodinexovapakekis.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/o339ckiuii5ij76meb7h8395s9/petegamuwejage.pdfIn PDF document text
    • https://npkfertilizerproduction.com/d/files/waxodapunagiziwokaje.pdfIn PDF document text
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/97328676151.pdfIn PDF document text
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/17911470969.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16137e63b0a531---wimanozo.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_off0000e7be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ffd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD0 18644 bytes
SHA-256: 93e7a38151d318243d6816a7c4a9d648a7312e29991b2855c501d01f35ec7950
font_02_sfnt_off00012fe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FE3 11088 bytes
SHA-256: 755e5a08f01d424295af8598579cae14607a1f1601664007126ab8e6d3683e06

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