Malicious PDF — malware analysis report

Static analysis result for SHA-256 820a4e3391b9406d…

MALICIOUS

PDF

89.7 KB Created: 2021-08-10 00:43:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c5764113702949e3b88c07a2fbd0f51c SHA-1: bac590342ada3683e5ac767d321465a3b3240a9f SHA-256: 820a4e3391b9406d003eda1c0a94378f9870f90287e165cb968d8873875f8216
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically related to phishing. No scripts were extracted, and the document body was unreadable, but the heuristic findings clearly point to a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/92852170161.pdf In PDF document text
    • http://global-insurance-broker.de/downloads/86742655914.pdfIn PDF document text
    • http://abwbaltimore.com/uploads/files/22361598545.pdfIn PDF document text
    • http://mkngsp.ru/upload/files/xalilabud.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/nakusesofab.pdfIn PDF document text
    • http://adainst.com/uploade/files/20210705125316.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8b61002ab3---4248817215.pdfIn PDF document text
    • http://stpatricksreunion.org/clients/84553/File/81695552476.pdfIn PDF document text
    • https://menuiserie-sainte-anne.fr/userfiles/file/48240295340.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/jesuguwojalikefizajufazo.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160caaf5c84354---wibafizujigofor.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160850c6812aa2---netilaposi.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/lukiniwoxuraxibumokeb.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd67c7e5c1---5702343409.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/dkedist24v49g2501kfhro9qn9/laguwelafadiditewivib.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160f86e8cf16f7---4500540100.pdfIn PDF document text
    • https://empresa-venta.hr/files/dizanepisixi.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16092016801f44---2126855914.pdfIn PDF document text
    • https://rajakeempat.com/contents//files/vawigazifisusixabimoxidu.pdfIn PDF document text
    • http://mobilephleb.com/clients/2/2d/2d2188d13063160162e6e2bbcdac547d/File/gumoramituwe.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/rrnsjl6d2ogjmmkq6s85gs0107/77898199749.pdfIn PDF document text
    • http://kondicionery-fryazino.ru/upload_picture/file/75702734607.pdfIn PDF document text
    • http://quick-thailand.com/images/uploads/file/81825395828.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d227e616fe---givawapurulojasarezejim.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071c9fada50b---pasefit.pdfIn PDF document text
    • https://art-lamps-rali.eu/files/file/geluxudifapev.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/n6r7ubc4v4ph484tn7dmjrbjdb/67436144198.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=flexible+work+arrangements+policy+template+singaporePDF 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_off0000f900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF900 11228 bytes
SHA-256: 29c07b699a0b61653b10f28d0468973a4b2be29f83babc7c4da10b6f2bd17eb3
font_01_sfnt_off0001132e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1132E 17212 bytes
SHA-256: 587b6f19ba29651e38c59408465158514cd0b65ab923fabff0c3abd9f5b71751
font_02_sfnt_off00013fd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1