Malicious PDF — malware analysis report

Static analysis result for SHA-256 85ff6cb442b75011…

MALICIOUS

PDF

147.4 KB Created: 2021-07-13 19:43:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f685ce5a148e1bb6c150d8ea446cbe78 SHA-1: ac159d5dc09bc2edbbb7b9d7782e4cc0ac68ba1c SHA-256: 85ff6cb442b75011ef3f5cc7340b21567d9e74447b311d84497d4711fde0037a
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier as malicious. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The presence of these links suggests the PDF's primary purpose is to direct users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://studiopignotti.it/userfiles/files/41803282362.pdf
    • http://conniecorsentino.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/64935628224.pdf
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076164c604ba---viratajajar.pdf
    • https://eliteplacementagency.com/uploads/files/93712070402.pdf
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/5e7145653d477dbd018dddafeb2efad4/78282336674.pdf
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/fuzedegewivefexikorako.pdf
    • http://autoshiftbid.com/fckeditor/userfiles/file/16821624806.pdf
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d39de12bdd1---busemevutufarixowig.pdf
    • http://essiac.cz/UserFiles/file/malebe.pdf
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac865b28569---50709942513.pdf
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/62a9c06338b455cb1832baaabf841340/nezopilurinitexifilov.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd2a3238d1---disepimowomapibaduguro.pdf
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ffde4e386---66386045030.pdf
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8f4b34b34e---19083082516.pdf
    • http://crosswaysrecruitment.com/userfiles/file/19540999340.pdf
    • http://papaicountrylodge-longstay.com/user_img/files/75833316892.pdf
    • http://czytamzezrozumieniem.pl/userfiles/file/52889849176.pdf
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/f5812e4259b943f5fa44a4d6a5b1d223/95081948949.pdf
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606d24db09641---18473098937.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/kr59k9289gnbm2sdil52g35a7v/ruwufopubeki.pdf
    • https://vishalahospitality.com/ckfinder/userfiles/files/44897898916.pdf
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/dc2d232bb1e4d105fb11d233bb23b5ba/vetetuzixumarutag.pdf
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160931b0fe8f86---zovutebujegemijolamomu.pdf
    • http://www.pattyn360.com/upload/forum/files/40801507224.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=is+any+a+singular+or+plural+pronoun
    • 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_off0001dba8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1DBA8 16792 bytes
font_01_sfnt_off0001f3bf.bin
5077e8a4e1ef37a69eaae0fdfcd24fd9b911bb501e621e429fa5363830187ccf
pdf-font-stream PDF embedded font (sfnt) at offset 0x1F3BF 10364 bytes
font_02_sfnt_off00020b39.bin
bc4a65e067a77d92cee1856ec7575bc5e89fd2e5064ebcd50350bfa573a57762
pdf-font-stream PDF embedded font (sfnt) at offset 0x20B39 19784 bytes