Malicious PDF — malware analysis report

Static analysis result for SHA-256 71a53a36f4ae8a77…

MALICIOUS

PDF

66.6 KB Created: 2021-06-23 12:05:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: c96db0811cdaa2b74b9bdbea30f800a4 SHA-1: 73de7f51908ad2b1595cc82163ba36dcab5cf7d4 SHA-256: 71a53a36f4ae8a77aed20419803eecbc6f8d39ba36d9368ba7d3005883351967
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to other PDF files hosted on compromised websites. The primary purpose appears to be directing users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160802cfe66912---36544680125.pdf In PDF document text
    • http://birnagarcollege.in/userfiles/file/mojujasulinututeji.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/061e26e97c9f504fc5a616125390b717/zilotagodug.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ae79f972b7---74474710430.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/o2p257d2eonheprqrsrshcamq4/27344782935.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/d37735ffa044e8a52eb920aa7cfef133/16166903615.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/n7p90qdm3ifjt722t4roaprn17/kalizovitowar.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/humphimr2b5cbjj2i30ksl0f65/71740113309.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/6102139832.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/f7a9f2f74246f1c7b5e080c6ea63acd3/jomodadojoma.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b81b9056c---12848720884.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/6b887f8cd0ad8d275cfa86db954e100f/fazijemazaned.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/ae63a00a50db9fb244ace42c2c5ba399/gopurobonutimaxifemu.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210516150827.pdfIn PDF document text
    • http://bradleyhillsapartments.com/demo/uploads/contents/file/40994049033.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/8083r1jtfl4mom2tkjo2l79ifv/konibuzifudowevaf.pdfIn PDF document text
    • https://abeess.com/userfiles/file/2403878940.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/4369b5678cfeef16577f5faa30c21495/17159139553.pdfIn PDF document text
    • https://saam.vn/images/content/file/30203074036.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/a9cfd4314bb21540dced87671ad13232/dupomomofebejipegik.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=topology+and+its+applications+pdfPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c69b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC69B 5276 bytes
SHA-256: c04a4327ab2e9a24787ec78659ee1624416193b0330efca656908d0908cf7e6c
font_01_sfnt_off0000d8b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B2 10160 bytes
SHA-256: 2015f11f510b5c9b1e5c973faa8b832ae0d3d0d2e1baca3c4dd4a2cb0c79cac9

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