Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0097e9d5abdfdbf…

MALICIOUS

PDF

81.2 KB Created: 2021-09-03 15:24:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 809be39472bd0cac466d885c127961d6 SHA-1: 24eeb9806909114b7f74ff53322ee1e7844cadfa SHA-256: f0097e9d5abdfdbf0f4ebd4e898433d2676d2582b298b3f40032431c71ae6eee
156 Risk Score

Malware Insights

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

The PDF contains numerous links, with several pointing to compromised WordPress upload directories and other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through these links. The document body is unreadable, but the heuristic firings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://xn--d1achljw0b.xn--p1ai/content/upload/sebatelifaxawisejig.pdf In PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/c5b595e31bf819c2155115764706a2da/84569563122.pdfIn PDF document text
    • http://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/51097883943.pdfIn PDF document text
    • http://ciccioinpentola.com/userfiles/files/325041710.pdfIn PDF document text
    • http://cloverdiamond.com/file/14009581480.pdfIn PDF document text
    • https://www.jancsoalapitvany.hu/ckfinder/userfiles/files/goxabenujuzunawomoro.pdfIn PDF document text
    • https://swalaya.in/userfiles/file/82617267950.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16086c6a232a5f---60147317486.pdfIn PDF document text
    • http://pretaporter-pegah.com/userfiles/file/gijugefizer.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e5f58516f0d---samefefututividetoge.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607241d611cfb---79061411103.pdfIn PDF document text
    • http://ozona.pt/wysiwygfiles/file/pesopafalu.pdfIn PDF document text
    • http://tonwen.org/userfiles/file/31820908446.pdfIn PDF document text
    • https://hiddencliff.kr/FileData/ckfinder/files/20210626_AFFC1A5EC758EAF7.pdfIn PDF document text
    • http://jkohut.pl/file/19968416613.pdfIn PDF document text
    • http://mywayrtk.info/userfiles/file/97445875892.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870cc020a7f---29194322643.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/4066285086.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087d3e70039b---55906386759.pdfIn PDF document text
    • http://amdind.com/userfiles/file/51887142555.pdfIn PDF document text
    • https://mauspro.net/upload/files/14883188202.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/57368061461.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=aneurisma+aorta+abdominal+pdf+medigraphicPDF 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_off0000da21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA21 11288 bytes
SHA-256: 424b0999100f4ffedc87183d88d729c2793140d128ebaf9c211c5e8aa75982a5
font_01_sfnt_off0000f40c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF40C 16508 bytes
SHA-256: 1c8f09a1892927fc2c7b0fe99da081deb3f6a1c6ef0274b18421681c9da18373
font_02_sfnt_off00011eea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1