Malicious PDF — malware analysis report

Static analysis result for SHA-256 c842ca5773e701d8…

MALICIOUS

PDF

85.7 KB Created: 2021-07-13 23:09:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 92f878cf3c1d54b62c0b0d2d2646522f SHA-1: f71dde7d39ea1ae207412d81d5f35deb56ffa221 SHA-256: c842ca5773e701d8d5b26a4edb4ef447da6d7ebb3051a477573856bfdbaf86cf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware delivery campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://huntic.ru/uplcv?utm_term=maslow%27s+hierarchy+of+needs+theory+self+actualization PDF link annotation
    • http://alexhoffordphotography.com/temp/files/file/vebujelodelatab.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/0fc585d5ca41bba7fae29c9447f140a2/dabawolewanudosexujam.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/35401516216.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b894c03c860---bizopazazo.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/59b60148b7647bead7f926d8b3f9beb2/31087767967.pdfIn PDF document text
    • https://etimes.mn/uploads/files/dugodijurifowi.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/ab83f4920a4b1488c21fe8da843bc866/logaxisunowadiwaxonejawa.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/buwirugefepetejupugajepor.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/ne561ebvd1q9ld9rf7neit4k5b/24391966122.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ae8242a2017---figemeko.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16093e93e9e63e---verunimijogaxobolo.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160beeacb228f2---79197256757.pdfIn PDF document text
    • http://aotwresort.net/ckfinder/userfiles/files/fesebulunofetu.pdfIn PDF document text
    • https://mehreganimaging.ir/images/upload/files/50378206413.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e505d65683---19944057319.pdfIn PDF document text
    • https://viessmannboilers.ca/fck_upload/file/rodedavagabe.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/r5mm81r0jvm6fg2et5ku2p35hl/zogekogivakura.pdfIn PDF document text
    • http://reanda.com/jingkelun/userfiles/files/20210706055031.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/59a6e9c44618cd3f67e7023f9ba5db56/10774692877.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/78984882322.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/0373fcb318f77b63cc75092ab7db0857/56281867762.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/ned1h3bjh3afpqg3tnr495u61v/demevunimokebojuregobe.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_off0000ea81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA81 17488 bytes
SHA-256: fb57393c58ce7cddbfbb57895e51123cab0938e4c285d25d2a6490e75c247de8
font_01_sfnt_off000117ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117AC 10960 bytes
SHA-256: 376b2e84c5a0a70f812bfdebf2bff423dc1cec7486e50567a7df7d725e9a79ec
font_02_sfnt_off00013137.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13137 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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