Malicious PDF — malware analysis report

Static analysis result for SHA-256 90bb1d7813e6c1fa…

MALICIOUS

PDF

85.6 KB Created: 2021-06-28 06:52:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 84d8564ee41118998c74a870657f1807 SHA-1: e1db219a08783313891fb8da8fb075fbde4d98dd SHA-256: 90bb1d7813e6c1faa9178a1d5efc54c33a850f77da3fea0e8542d7f23be05121
96 Risk Score

Malware Insights

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

The ML classifier strongly indicates maliciousness, supported by heuristics identifying the PDF as a link farm pointing to compromised WordPress upload directories. These links likely serve as lures to phishing sites or malware downloaders. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • 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://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f8085e2a66---58301689519.pdf
    • https://aakritidigitals.com/userfiles/files/xekuli.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160918bc8265e3---ninikasogav.pdf
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/29a19534e8f82dabde77f8cff196480f/mixumokofudasinonipowor.pdf
    • http://statewideroadservices.com/clients/879378/File/69298703787.pdf
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/f17a414e604fa298b543a69860268910/34818722222.pdf
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/0db1e1a428f7bf8d346b03c668f29ed5/vifagixixamolizo.pdf
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/5d3e05f99c9872cc3abd7ed5e0e50da7/88210543784.pdf
    • http://yaqeen-eg.com/userfiles/file/57692086720.pdf
    • http://ge-mak.com/files/ginaxepawelizugumires.pdf
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/c6c66843a8d9403c39f3f66d75e90604/tasijanan.pdf
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/6ff8f5a77d41719907574b260fc7a5fe/mamiriputizulanugibexik.pdf
    • https://daiichigroup.net/uploads/news_file/riwogo.pdf
    • https://dietmoitangoc68.com/upload/files/91152953971.pdf
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/16fae073fed9f922fcb8e76f090eaa34/lususivapixefidivenigax.pdf
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/b4sr2vaj3b0qh94o7m6mucjud5/ranurozotam.pdf
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16078cff73f28a---xesemejijamana.pdf
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/d8669609f6bfa8a77adabca7628b42e1/lamakojat.pdf
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/3898be981db9299be28bd47ed0911bbf/93184046362.pdf
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f08327db78---wiwalerafiluwunadugi.pdf
    • http://plafondchauffant.fr//img/user/file/75090589581.pdf
    • https://turismopontevedra.com/ckfinder/userfiles/files/lamezexegomudizamuvusudet.pdf
    • https://bedandbreakfastchia.it/userfiles/file/89669141634.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=earth+time+for+one+rotation
    • 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_off0000ecd6.bin
eab459f959f5d2e6d1e170226b39491f4aa822917e9df350e9a7f438d0ec5c5b
pdf-font-stream PDF embedded font (sfnt) at offset 0xECD6 10248 bytes
font_01_sfnt_off000103a3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x103A3 16792 bytes
font_02_sfnt_off00011bb5.bin
76fb8b0b4227648f658245cc3625b58a8d6863fb5225d62c7f13b8971af27f56
pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB5 16844 bytes