Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb31797e83b12916…

MALICIOUS

PDF

73.6 KB Created: 2021-09-04 07:04:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0f48dbf3a3669d455ef4281e37b97b9f SHA-1: c2b8a48cc935a04f9ea318d8e94caa05bd7a211d SHA-256: fb31797e83b129162ab0c5b3a5bedf76e314e80b46ce99ff541a9c4f96915eed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://majorsagilekvaros.hu/uploads/file/xajibujabuxesawililati.pdf
    • http://hokeypokeychallenge.com/clients/7/77/77ac66e313b6cb4bf602f1678accca72/File/15127022621.pdf
    • http://ags-sib.ru/ckfinder/userfiles/files/givijevufamovogis.pdf
    • http://velo.hu/UserFiles/file/80418598077.pdf
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cf86e8e8938---56910248497.pdf
    • http://simoncaulkin.com/images/lesufilirowabul.pdf
    • http://arniestribu.com/campannas/file/gavixijutaj.pdf
    • http://beijingbeat.com/contents//files/gepimivedudeninoz.pdf
    • https://suthuytinh.com/app/webroot/uploads/files/bononabuperisokodarovom.pdf
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a8956054148---zojiwama.pdf
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad93e8bf0ca---25778468807.pdf
    • http://jcbcharpentebois.com/ressource/site-image/files/notidirilijifiroluso.pdf
    • http://prestopc.it/upload/file/98872184248.pdf
    • https://promaxsuspension.com/csmimage/file/43555538391.pdf
    • https://almavilag.hu/files/files/nasuwavowafu.pdf
    • https://s-serviss.lv/userfiles/file/dusiw.pdf
    • http://jakpaisanestate.com/images/upload/files/wiwoxigapimezovepuwazomum.pdf
    • https://insolite.lu/img/userfiles/files/fiwekuxamunikukilaruwux.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=spanish+reflexive+verbs+worksheet
    • 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_off0000bcdd.bin
31042d582c60e49ad7a31c25758a348676b3fc488d4263dc48fae94c0e6d31c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBCDD 11016 bytes
font_01_sfnt_off0000d63d.bin
c347011e0cb6ea187e4442e5ff8c5e23ebf07b32a09183cfa8eb2a1e40ee2014		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD63D 16648 bytes
font_02_sfnt_off000100fc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100FC 16792 bytes

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