Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f73603519644124…

MALICIOUS

PDF

85.9 KB Created: 2021-06-25 23:45:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5bb7559e9d625e9becc58229212d70af SHA-1: dcd14fbe6fe1051c42333a2bee569a7386e407af SHA-256: 0f73603519644124f4941eba373d5df9d24edf47fe151ebe34a9f435ea4b683d
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 ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites, likely intended to redirect users to malicious content or phishing pages. The presence of multiple external URI heuristics and link farm indicators supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ccb134c61d---95332827195.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160832003873d6---8147725320.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1606e4dd7296d2---vugikeni.pdf
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075fab9e80ac---topuvimujalezigi.pdf
    • http://fairway.cc/images/blog//file/dojem.pdf
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/a29f81028e1156dfccd846032b6a66af/79551221258.pdf
    • http://vitanova-cattery.com/upload/file/rusifixegaxu.pdf
    • http://vattucongtrinh.com/userfiles/file/pimuwigutovajezudije.pdf
    • http://myjacksonfamilyreunion.com/clients/e/e2/e2167ce47089e9b789d53270b7cccc99/File/badexaruloge.pdf
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/b83d8427ee6ddb2b4646d9cf3e76d864/234915564.pdf
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608267758f1dc---fowigid.pdf
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606e3e3b571d2---84538634627.pdf
    • https://hse.tw/upload/file/weluri.pdf
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607e67bf1f5ea---xabaguxufesuxumupe.pdf
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/29765263363.pdf
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/7vs4c2relbcgojkkpm7ktgbp57/pezuvigonap.pdf
    • https://anmimar.com/royal/userfiles/file/42646280784.pdf
    • https://activepymes.com/pub/file/89011564089.pdf
    • http://rld-carbon.ru/file/52497553039.pdf
    • http://arslanemlak.come/file/nobumalexox.pdf
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/7fc5f5941cfff4963b269bbb8aaec227/luxozorerufobaduxep.pdf
    • http://fdscience.com/UPFILE/userfiles/files/moritejef.pdf
    • http://wib24-admin.de/uploads/file/76401555863.pdf
    • http://qtjdb.com/UploadFile/2021/05/26/file/20210526_063615_168.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=how+old+is+the+earth+2021
    • 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_off0000ec22.bin
58ee458eb3dc581a542a02d13e2e04b8da96ee0365f499227499692e749e2c98
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC22 10612 bytes
font_01_sfnt_off0001049e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1049E 16792 bytes
font_02_sfnt_off00011cb0.bin
28bd95f568c7e8d59c22ab4bcac581b7c0bde0f7eb28ccbcbb07642736bf5046
pdf-font-stream PDF embedded font (sfnt) at offset 0x11CB0 17600 bytes