Malicious PDF — malware analysis report

Static analysis result for SHA-256 0498de6f172701c0…

MALICIOUS

PDF

76.1 KB Created: 2021-09-18 15:29:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a6795b339458fde0e8c412afcf8e27bf SHA-1: cb048bb3d0b11b51be62803f2e39c1cd6c021416 SHA-256: 0498de6f172701c084c0e2102dc49b5c4c12868cdc4e85a8d4a290365615f735
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://crysiq.ru/uplcv?utm_term=best+poster+making+software
    • https://usgcambodia.com/userfiles/file/mesorologosokeko.pdf
    • https://oriental-kitchens.com/userfiles/files/degoveneziwiwawuxadenov.pdf
    • http://ifaistos.reality.gr/~triantaf/images/file/42524562616.pdf
    • http://pensionpoint.cz/userfiles/files/6110078622.pdf
    • https://alzubidi.com/userfiles/files/24969984581.pdf
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614553e211b88---joderedetoputudog.pdf
    • http://www.terresdescaraibes.fr/file/51081480792.pdf
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/wases.pdf
    • http://think6.net/ckfinder/userfiles/files/20210904164354.pdf
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/c63qp82dfugce0h63a436024jt/80969857971.pdf
    • http://ozt.zielonetarasy-cieplice.pl/uploads/userfiles/files/mitelofokatuzizuvujow.pdf
    • http://cnhhgj.com/upfiles/userfiles/file/fimavajasujapabixezixo.pdf
    • http://slsnn.ru/content/files/lukoribobujuzogimiwux.pdf
    • https://euronuts2009.ge/files/files/kesonusisujilukugezebo.pdf
    • https://kaktutzhit.by/uploads/files/sifofenam.pdf
    • https://indiachristian.org/uploads/files/pixepugosavoral.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161334cbd9bbf6---ludizun.pdf
    • http://madmojo.com/fckupload/file/91997430463.pdf
    • https://ville-saintleonard.fr/pdf/kuveluxelanuxodejujupa.pdf
    • https://biroestarsa.hu/uploads/file/97102129704.pdf
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/44215160604.pdf
    • https://unitedfightalliance.jordanadams.com/ckfinder/userfiles/files/deviradijex.pdf
    • http://neilreardon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/56576408401.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c5a7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC5A7 16792 bytes
font_01_sfnt_off0000ddbe.bin
7295855ef6d2ab8d427867e88405c4893bd1e44fad00c76c4474d5e48c237aea
pdf-font-stream PDF embedded font (sfnt) at offset 0xDDBE 10884 bytes
font_02_sfnt_off0000f70b.bin
f3aabe57e3db1bf6bdd226e3446e5a4b4edb07e8a48a2d443160b82dd06e8fd0
pdf-font-stream PDF embedded font (sfnt) at offset 0xF70B 17028 bytes