Malicious PDF — malware analysis report

Static analysis result for SHA-256 8977994fac2743a7…

MALICIOUS

PDF

92.9 KB Created: 2021-07-02 18:17:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 07fa41dfd1b9a37d7d099f545f8bc56b SHA-1: 61f33269860320c9657683a3e6388f9f13a09c76 SHA-256: 8977994fac2743a7754a7077f433c323a7c7c538790a7b16994df2f742c3f277
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to compromised websites, likely intended to lure users into downloading further malicious payloads or to phish for credentials. The presence of multiple distinct hosts and the use of disposable hosting further indicate a malicious intent to distribute harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://diegogenna.it/userfiles/files/84337323099.pdf
    • http://www.onlinetemsilci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160777c519c422---lesezuwepoga.pdf
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160dbd5f6bcdbb---33519678683.pdf
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/d73b898421e16d0bdad3d463ba7d062e/lalesunararenuj.pdf
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/b38700282646482d493ee1d6998f581a/44028233600.pdf
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/2rjftbprdkf665kp9qc8pm5tr0/kujenijejolube.pdf
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/d40e978742d784cbae8bf634b450ab2a/buwovitapesegimovuzu.pdf
    • http://florylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pibifenudatugekepa.pdf
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607522ec146df---82674162466.pdf
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/cdqc6kut3rv8pd356ig075bvno/kususeso.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c9e5151142---wafexugijokuzusotomuw.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160883833f1914---seguwaxog.pdf
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/c439e44aae0a59bdc6d932ff9cd5a434/60430736367.pdf
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16091f958bf24f---47773676573.pdf
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/977a5c157ca54d522a0555dbb55987e4/rivisesatupatemigotu.pdf
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/d5ac09fe1c31bd060969a6fd9f7a4f91/pegabumujotalexoja.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/aoj6nl7o8asava3fm3geh0pqf2/zofuvonorafizifemad.pdf
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/lklhh41rg7j3qouj7fe9citlo2/53707997045.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa4700093f8---46286946744.pdf
    • http://cameranichietsu.com/luutru/files/nasux.pdf
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/c5ce8c933a446fa24c422216eadff2da/vageronuf.pdf
    • https://accuratesearch.com/userfiles/file/36474690789.pdf
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab6ad0c0b3b---49319993160.pdf
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baee9371667---zogejuf.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/13d1a0d753dcb7b0ede3f2c670aaceb8/16750299426.pdf
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160878d440e584---vozerisimadadi.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=quiz+for+class+3+gk
    • 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_off000106a0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x106A0 16792 bytes
font_01_sfnt_off00011eb7.bin
c597b9a1eed27303cd3e805a9feb2520c442363ea81582e76dd58519e2ae5346
pdf-font-stream PDF embedded font (sfnt) at offset 0x11EB7 10660 bytes
font_02_sfnt_off0001376e.bin
f422ecf4a5ee3048e0cc023c64f8219210ab76f78816985ad76c1b332cdce798
pdf-font-stream PDF embedded font (sfnt) at offset 0x1376E 17864 bytes