Malicious PDF — malware analysis report

Static analysis result for SHA-256 164c49d9f0ca49e8…

MALICIOUS

PDF

85.4 KB Created: 2021-06-27 19:44:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3006471915106a0c6059fb033d43feb5 SHA-1: 119afb2d47afd73af5e2db330788c5606df6c5de SHA-256: 164c49d9f0ca49e8a8ae132d46c08d61f9b63a1447f56afd64f88cbdd0e059d8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous external links, many pointing to compromised WordPress sites, suggest a link farm designed to redirect users to malicious content, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://aquatrustfina.com/userfiles/file/2625780480.pdf
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/194b894b6286decc9af98e6c66e069f7/fegudewasadeteze.pdf
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160759cb841ed8---67021504433.pdf
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2c4d63763---58410031397.pdf
    • http://gayaarchi.com/userfiles/file/20210626075210.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec8a447dd4---11524759390.pdf
    • http://www.allatpatikapecs.hu/images/file/94808168252.pdf
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16072241485404---kafaxabemegilo.pdf
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/e92l1kg53j8n8o4amf47koj6m7/37309473180.pdf
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/e6e8137d250cc3f2be7e97adadcdc5b4/2415792993.pdf
    • http://ciaooo.ru/uploades/userfiles/file/19173459938.pdf
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160d5ec4ad30b0---49652039444.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b5966fa6e---xaxezegepuveposipi.pdf
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/pbfmjf6p1hieibqgt0hssmokm7/zominu.pdf
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ab352083200---wijedavo.pdf
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac421443a47---54499959492.pdf
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acf11abc246---5136457948.pdf
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/3feec0962a830a5563fb7ec3a892ec53/xozarusif.pdf
    • http://bugaboo-buffalo.eu/UserFiles/File/putekito.pdf
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090c16561cd3---rofikos.pdf
    • http://cs-golfclub.com/ckupload/files/21850578180.pdf
    • http://deurenhanger.nl/userfiles/file/bujapikizi.pdf
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160babdaed8923---12247081591.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=15+millimeters+to+inches
    • 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_off0000f017.bin
88c4f39a9f6a24e2eb898a4738c942d6ba0501c528b90ccda029fcad4ad1005b
pdf-font-stream PDF embedded font (sfnt) at offset 0xF017 15912 bytes
font_01_sfnt_off0001190c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1190C 16792 bytes
font_02_sfnt_off00013123.bin
a3b3eb7019b00250e1ae0deb2e5fab799a12a3326fb9a08826e82563f9a31b5e
pdf-font-stream PDF embedded font (sfnt) at offset 0x13123 10420 bytes