Malicious PDF — malware analysis report

Static analysis result for SHA-256 a95da9ec707a0105…

MALICIOUS

PDF

84.3 KB Created: 2021-08-07 23:43:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 886b5dac4333e4588e46ad0ade044272 SHA-1: 11e3a3cd3e589828e5775f0c31b8f2ed2745ea81 SHA-256: a95da9ec707a01056b14938b3808ea63150c16bbf96345a3c6fbed131ca8e31b
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS upload storage and disposable domains. The presence of numerous unknown reputation URLs suggests an attempt to distribute malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://apisicul.com/userfiles/files/tikup.pdf In PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d49852dab---binemekegon.pdfIn PDF document text
    • http://cosmic-kino.ru/sadm_files/mokovexinudowojisatoro.pdfIn PDF document text
    • http://sankoufurniture.com/upload/file/54726833655.pdfIn PDF document text
    • http://jkbprivateiti.com/userfiles/file/xedufewabibugifufibavova.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/ninusezumelinizug.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/58263790846.pdfIn PDF document text
    • http://wksx.top/images/userfiles/file/86277666875.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/50b7b3a37fae28bfabfbc2995c67793d/pipugisarelibogure.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606fbf080709d---muzapewutokijixeg.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/sasozofes.pdfIn PDF document text
    • http://springbook.no/files/sapelixuro.pdfIn PDF document text
    • http://dienvietbac.com/uploads/files/kifinovamorido.pdfIn PDF document text
    • http://showplus.ae/userfiles/files/kafosegosatexixesevijexa.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/dusixegib.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16280679226389.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/43340073454.pdfIn PDF document text
    • https://aldwalia.com/userfiles/files/dapapejuz.pdfIn PDF document text
    • http://55thocscompany.com/clients/62662/File/kobutipebedikav.pdfIn PDF document text
    • https://carcable-bg.com/uploads/pictures/files/4289169382.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/235231e73087152a71c2eb24ed322331/97583832437.pdfIn PDF document text
    • https://laser123.com/geektic/files/17520157205.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd255cbfe2---46088259776.pdfIn PDF document text
    • http://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/polalurafozi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=how+do+i+fix+the+connection+failure+on+my+honeywell+thermostatPDF 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_off0000e7c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ffd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD9 16108 bytes
SHA-256: 26bd4c019a59c6c913d46678031d3da296c2fb2df7a1724c134b41b799f9b9cf
font_02_sfnt_off0001291c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1291C 11132 bytes
SHA-256: e885b92f53bf392d5991c43baee0e8eed4e9c83c17e453f1648b848af0b58664