Malicious PDF — malware analysis report

Static analysis result for SHA-256 3944505a45a06f01…

MALICIOUS

PDF

99.5 KB Created: 2021-07-02 15:16:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2905010f4c41a40207bf08754a37f278 SHA-1: 547462309780509d59851ab3b23eabf706f1e68f SHA-256: 3944505a45a06f015e98c8a45cf2102caba10a46bf1e83eb0c41e36ea00e7efd
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains a link farm pointing to numerous domains, many of which appear to be compromised or disposable hosting. The presence of a 'download button' heuristic further suggests a lure to download a payload. The URLs extracted are the primary indicators of compromise, likely leading to further stages of infection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9872

Heuristics 7

  • 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.
  • 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://archism.ru/uplcv?utm_term=blank+crossword+puzzle+template PDF link annotation
    • http://oresteruggiero.com/userfiles/files/4526529768.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/r238s7cuj7m5bjv4ubvftcosa7/gepogod.pdfIn PDF document text
    • http://jkbprivateiti.com/userfiles/file/69459820817.pdfIn PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/gapoxegudatex.pdfIn PDF document text
    • http://smeeing.com/userfiles/files/xavedet.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160bf198baac14---sufupeluzav.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160a3719970595---89735806028.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/egtr24nivglb1dffb3ujv84n53/gafes.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098a952d7180---felakutobutate.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/a80da20e0cf4b5ce5bdfb27f8bd1b2d8/42972478188.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16093b82275f0e---dowekelavitikuvaximofamob.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/b7088f7cdc8e4ef2034e2c2b104e4990/toseno.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/979fd74c5b7fa780fc48f874a9c33876/16436363524.pdfIn PDF document text
    • http://tauben-buchmeier.de/kleinberliner-schuetzen/userfiles/files/44218098956.pdfIn PDF document text
    • http://cedule-plachty.cz/files/file/temadukajarifiwexuf.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/bpca04u1gevua18q057jte0inl/moralizutuwebugebele.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/l504djtjncr8mdhl9q1a8ifrbp/dutiva.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/49605374677.pdfIn PDF document text
    • http://agrilaui.com/userfiles/file/92033396818.pdfIn PDF document text
    • http://aclamerica.com/customers/CMS-IMAGES/file/levokixa.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c09402d15fe---86203754600.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/590c108dbb92dba5f29402568f30fff6/46801799114.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/supekamese.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/68b8b658c3b97bc221c7958d270133bf/funelisokudajemib.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_off000103da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103DA 17612 bytes
SHA-256: 7b905c41c9e66a8585ff13d6667781a25458f0ba51051bb184d46667890a6b20
font_01_sfnt_off00013227.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13227 18056 bytes
SHA-256: 763091a1cd4dc55378caaeb684490f5b6ac78dd569ce3a399cc8f7baad2277c0
font_02_sfnt_off00014e83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E83 10972 bytes
SHA-256: 94ebf93f69ae9783f662f87102dbdfdadce92498adcee42228071fa45736cdf6
font_03_sfnt_off00016829.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16829 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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