Malicious PDF — malware analysis report

Static analysis result for SHA-256 09a73f50116d4f9a…

MALICIOUS

PDF

78.2 KB Created: 2021-09-04 10:54:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6e1a1c2e545ca8f97e07214b4b0b53db SHA-1: d41049e63e1f3f22d35fde5f3cdc96219a4cd745 SHA-256: 09a73f50116d4f9a8c00934f9238dbef1f6ab660750b5a131b8ca05c168c07c2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the overall structure point towards an attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://bloemenwinkelindex.nl/images/uploads/bevebepewapuzu.pdf In PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb082e3384e---jixakezimugevefanikako.pdfIn PDF document text
    • http://eichler-kammerer.de/26577179104.pdfIn PDF document text
    • https://koratspring.com/upload/file/25357213232.pdfIn PDF document text
    • http://chapelguild.com/images/usr/femumunoritujim.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160be463bdc952---77154356805.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/8fe57e5443a7dc7aa27ef83d7ffffe7c/47187163569.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d178a89e9d---33382034230.pdfIn PDF document text
    • http://thepokeluau.com/uploads/files/rubavogojovori.pdfIn PDF document text
    • http://artemon.nl/userfiles/file/pifiwutazu.pdfIn PDF document text
    • https://dovolena-jiznicechy.cz/uploads/lidosotugejefujogudalu.pdfIn PDF document text
    • https://galaxy-training.com/userfiles/file/20618108867.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608072c03edbc---80362063478.pdfIn PDF document text
    • http://taociren.com/upload/file/210808122903765627f09irjajzhot.pdfIn PDF document text
    • http://behtarinekhodetbash.com/files/files/22368117229.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/e2733435958b2ccad2166b361b2e9dca/94184540452.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/evjac5pa94takumrafgqd00e43/midusenaxita.pdfIn PDF document text
    • https://mimpishio1bet.com/contents//files/rojimumivebaximidepa.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abc102ef256---ragevemizegilod.pdfIn PDF document text
    • http://giadinhmedia.com/uploads/files/11319186218.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/vqet8dfhehuoo3rukt94hk8m9j/getigesuwatemimi.pdfIn PDF document text
    • http://clinicaveterinariailmarzocco.it/userfiles/files/99906571262.pdfIn PDF document text
    • http://2446665a.ru/ckfinder/userfiles/files/nopemugawivokonabofopi.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160fd5c0099bdf---ziluzusunixiwimux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=clothes+in+english+worksheetPDF link annotation
    • 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_off0000cd20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD20 10432 bytes
SHA-256: 987423ff6bc51ad1d083dc579b0fa243403a1ed56e68a94fb841e7d869edb92e
font_01_sfnt_off0000e4d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D3 17920 bytes
SHA-256: a23d24147240d3cf3c74aa43212083b8ffa556ddf1549bbe780a840a68e009b8
font_02_sfnt_off00011338.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11338 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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