Malicious PDF — malware analysis report

Static analysis result for SHA-256 20493fb60ca28461…

MALICIOUS

PDF

83.7 KB Created: 2021-09-19 13:29:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3f40b46de811bbb46e6a161bf632e3ca SHA-1: 8199312f21d02e80b6e082f51cac1200f54c6092 SHA-256: 20493fb60ca284611c761f7e78b7f1fdbc6bafe232a88923c7e18b79ac3e1962
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, several of which are hosted on compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing or malware distribution sites. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://chrislahoda.ca/userfiles/file/ravodupopari.pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b18abaf40b---11550371740.pdf
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/2068f1afcd1c32a1bcb6d795b9cb3d1b/96899200707.pdf
    • http://dush-kz.ru/uploads/fck/file/savaxuwexitutubudikatu.pdf
    • http://montagnobozzone.it/userfiles/files/jobaxivuwujevo.pdf
    • http://ayurveda-shiatsu-nice.com/upload/files/nakugumuxi.pdf
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/d1784cd4ec6f7067f2c5109ef09e6abe/51318784654.pdf
    • http://www.letnifestiwal.pl/ckfinder/userfiles/files/vasowu.pdf
    • http://carbonelite.ru/file/48893631886.pdf
    • https://southafricapools.com/contents/files/lumikeze.pdf
    • http://adfaveo.com/image/files/20210915_211024.pdf
    • http://studioriboldi.eu/userfiles/files/bufakimapujekuja.pdf
    • https://pomtco.com/technical/files/file/gogaravosugo.pdf
    • http://vipforiraq.com/userfiles/files/24116566623.pdf
    • https://motty-etai-sharon.com/files/files/jaxesexirupeloj.pdf
    • https://dukra.sk/editor_uploads/files/vatemasejar.pdf
    • http://www.velkoobchod-man.eu/ckfinder/userfiles/files/kexakenonijumuduxo.pdf
    • https://zweefvlieg.net/userfiles/file/fafibafixovesabumatevogox.pdf
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/fu23goeh3canpb3t4fh46pftv6/61038633936.pdf
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132e4a3b0751---pobexetazofunujutukamixe.pdf
    • http://tienhasteel.com/app/webroot/upload/files/zotakeligevu.pdf
    • https://leganordavigliana.com/uploads/file/guxonufijapop.pdf
    • https://cristalparkhotel.com/ckfinder/userfiles/files/totaxajuzimukesokunavavuj.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=top+10+gallery+app+for+android
    • 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_off0000e1e6.bin
3866de5b16f9cc6bf87bdf7e8e0694c6b6e33b53b7e3fc276e1a19e2b27b5a4b
pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E6 17992 bytes
font_01_sfnt_off000110b6.bin
77256ca5187f4f7d0c6fee73b342afd3092f461d6a2dabfb5913484eeecad7f2
pdf-font-stream PDF embedded font (sfnt) at offset 0x110B6 10656 bytes
font_02_sfnt_off00012906.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12906 16792 bytes