Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9080c5c07885063…

MALICIOUS

PDF

90.7 KB Created: 2021-08-04 16:15:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 69b8bf1af3269ecf1a66ce55cff2b1be SHA-1: f0c12a93721329143bb2c92c225bcdc827db3d1e SHA-256: a9080c5c07885063ebd9b8abccc11591e557cfe537d23e3ae0be2e9c0c0e1588
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 are part of a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of compromised CMS upload links suggests an attempt to host malicious content on seemingly legitimate but compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://covinahigh1980.com/clients/1/14/147ee80f0cf2e08ca1b5067d21485a43/File/3572665448.pdf In PDF document text
    • http://taiwanglassgroup.cn/userfiles/file/20118436910.pdfIn PDF document text
    • https://lentes123.com/aym_image/files/55185637524.pdfIn PDF document text
    • https://hoakhanh.vn/uploads/image/files/luwalavufo.pdfIn PDF document text
    • http://fluitec.fr/ressource/site-image/files/20722607384.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/tawitajewelonuzugufoj.pdfIn PDF document text
    • https://susta.vn/userfiles/file/9695748106.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16094985bf0686---74793395927.pdfIn PDF document text
    • https://mkserwis.pl/userfiles/file/76754082485.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080537c9c914---sofezibiwiwanip.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/lo0mpbr7mqmacpa0m45vql2i84/lelimewo.pdfIn PDF document text
    • https://digireg.lu/upload/96828957652.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/8epob46cgt4sltb9dj55gc5nfh/70793513245.pdfIn PDF document text
    • http://huucodatlanh.com/userfiles/file/88883562410.pdfIn PDF document text
    • http://langfordfinancialservices.com/userfiles/files/voxafegudufa.pdfIn PDF document text
    • http://legalinet.eu/userfiles/files/2419598637.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/zetifu.pdfIn PDF document text
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/f901a86711694599ea80ce8a23f2d894/98062231909.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/it6qdo2gi9purm15dc76e6qme1/42182499611.pdfIn PDF document text
    • http://coiffurenais.com/userfiles/file/wobevafajabaw.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/ad98811d60a3014a7b87ff2cfa80a835/koverete.pdfIn PDF document text
    • https://best-label.com/upload/files/zajolusibifurimapewugobe.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16070b06b3a815---kafoxoguj.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/84425856c56c661de5bf540c9b7fb455/7012578573.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=what+of+this+goldfish+would+you+wish+character+analysisPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC44 17136 bytes
SHA-256: 4ac11a2b42ed05e21e2f4d48be94b11866bd5b7cf47f6b768fd433a0587f0554
font_01_sfnt_off000127c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127C9 11048 bytes
SHA-256: 824533b95ca8dfff8a6857905a7cdd38cc4baaa8e1a2e4bb93b3f3819deb8480
font_02_sfnt_off0001415d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1415D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1