Malicious PDF — malware analysis report

Static analysis result for SHA-256 e581d383a5b0b42c…

MALICIOUS

PDF

76.5 KB Created: 2021-07-17 08:49:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0694205731c3b0e80d3c9c4f26dae6eb SHA-1: df4a0126346b0e7dbe0db64cb209f63f9ba15808 SHA-256: e581d383a5b0b42c56e8cd8b62788a802b950cff60a946d08163e3bfe7c669d6
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 high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs pointing to compromised WordPress uploads and other disposable hosting sites. These links are likely intended to lure users to phishing pages or download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/ltjfugss8al3b2b1un3pg4ifq2/rutiwi.pdf
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa2b945e936---4082607702.pdf
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607962a900bd2---2446022161.pdf
    • http://eviljoy.com/UserFiles/File/42021630635.pdf
    • https://etimes.mn/uploads/files/mivisamowojajopasota.pdf
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/99c697277bfb817f4983ed2f7682156d/pikexusudubesikewewu.pdf
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/pcnb9rmose9gs2ujrs0q3cjb12/xesiburevubisuzegap.pdf
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/779e75600094edba073e891fe467c80d/98841100564.pdf
    • http://xedaptheduc.net/app/webroot/uploads/files/witalizekegizotezizuj.pdf
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/cfu8p6v290495nac59tsrmhl95/subejapoxaxosa.pdf
    • http://argol-editions.fr/userfiles/file/88261989279.pdf
    • https://watfordfairtrade.org/app/webroot/img/files/2975441782.pdf
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/ujvje8t8jnbqm496fldhfv83r5/pefojelagasozu.pdf
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/538f9f196e45985ff62a732d58b768cc/mozudevokozesesizita.pdf
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/d036ade15f28a565b686d5c68a26b5de/59361488740.pdf
    • http://szpk.hu/_user/file/83743401893.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=iti+diesel+mechanic+engineering+drawing+question+paper
    • 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_off0000c7e8.bin
1a882741059fae271c62235275fab8bce19fb1d5bcfa1bd540fe19f8cc2acf97
pdf-font-stream PDF embedded font (sfnt) at offset 0xC7E8 16828 bytes
font_01_sfnt_off0000f365.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF365 16792 bytes
font_02_sfnt_off00010b7c.bin
1920f49b02cd79acb74caea75a27131477bbdf3d7fb082dba9eaef92bff4f9bb
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B7C 11244 bytes