Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c7a94ff6af4fd53…

MALICIOUS

PDF

81.7 KB Created: 2021-09-23 03:25:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4c54ecc3a3c506682e6834aa24cdc52b SHA-1: 3a46e55471ee0b9947218a4e9a9e76c468d7650d SHA-256: 8c7a94ff6af4fd53f0a7ccf715475a15d598daf7b7b3842232c2d566f90d0dbb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating high maliciousness. It contains numerous embedded URLs that function as a link farm, directing users to potentially compromised websites or phishing pages. The presence of external URI links and link farm patterns suggests an attempt to lure users to malicious content, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pixomot.ru/uplcv?utm_term=positive+words+beginning+with+m+to+describe+someone PDF link annotation
    • https://collinite.pl/userfiles/file/xivamobebatum.pdfIn PDF document text
    • https://kibledergisi.net/resimler/files/rulupawodebuna.pdfIn PDF document text
    • https://lawrenceyezersky.com/userfiles/file/20431965628.pdfIn PDF document text
    • http://csc0535.com/userfiles/file/20210917185957_rxlw8e.pdfIn PDF document text
    • http://tincorner.vn/uploads/files/41612040218.pdfIn PDF document text
    • http://kvrhousing.com/uploads/tudunedugoxopadipog.pdfIn PDF document text
    • https://hantverksakuten.se/ckfinder/userfiles/files/50876291476.pdfIn PDF document text
    • http://flywings.sk/UserFiles/file/gexazagerujosodaridogowu.pdfIn PDF document text
    • http://cy2hand.com/userfiles/vixikofeleripilov.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136f81e6e4dd---84522003197.pdfIn PDF document text
    • http://toanlinh.vn/upload/files/zotulepasate.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a29e6ccfa7---venevafonedo.pdfIn PDF document text
    • http://rainternacional.com/userfiles/file/xanulurisoviribad.pdfIn PDF document text
    • http://ivelinabozilova.com/userfiles/file/64507661278.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/46232573595.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e593d8e087---xigadekexowopuse.pdfIn PDF document text
    • http://sabaispa.net/userfiles/file/56462806302.pdfIn PDF document text
    • https://smobiil.eu/userfiles/files/vewovupulugedegedenedoda.pdfIn PDF document text
    • https://pbanerjeeservices.4digitmagic.com/userfiles/file/lanifulobitejutinusudak.pdfIn PDF document text
    • https://rarahil.org.np/ckfinder/userfiles/files/89533855906.pdfIn PDF document text
    • http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/91722717716.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f83f2956f2---99989492691.pdfIn PDF document text
    • http://xn--42cfa4ewb0a0b3fwh.com/imageupload/files/tugatowexikijaruwumomu.pdfIn PDF document text
    • http://xn--80adib9cjd8a5e.xn--p1ai/i/upload/files/jojiwikarazarozipujexok.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/o09gqb5dvmida2ee58qpu2ed86/zirosedulanu.pdfIn PDF document text
    • https://slezanie.eu/userfiles/file/juwotivimoturidevokipadid.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_off0000daa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA9 10904 bytes
SHA-256: 7b70638f2a417d7b2c29f6ad457dbb3d27a206a3c9acdb792a397203245eeab8
font_01_sfnt_off0000f39a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010bac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BAC 17140 bytes
SHA-256: d06cee151c30daf0d63693258530d215298604d9f1503bbc8770d62954fd22d0

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