Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f91fd52b4ca3d4e…

MALICIOUS

PDF

91.1 KB Created: 2021-06-29 16:57:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 34dcfa6263a06da816c133831c6568e5 SHA-1: 3105ea53f83487dbc145133dbf92cef8baafba58 SHA-256: 6f91fd52b4ca3d4e59f4111c9197e007e747bc2ec1323325ec921fc85d428aff
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains a large number of embedded URLs pointing to compromised WordPress sites and disposable domains, suggesting it functions as a link farm to lure users to malicious content. No scripts were extracted, and the document body was unreadable, but the extensive use of external links indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://philabc.ru/uplcv?utm_term=plutchik%27s+wheel+of+emotions+explanation
    • http://hondasushi.com/uploads/files/70244595937.pdf
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3ab5d5f73b---8207612181.pdf
    • https://beautyreviveshop.com/newerac2c/userfiles/file/gubuxatubifulegemijexa.pdf
    • http://archi1919.com/smlclub-files/file/paderesoj.pdf
    • http://sakem.org/userfiles/files/51120761325.pdf
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b6ab8a9868d---pilagimovudezunasekexi.pdf
    • https://roofmed.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160be2e3d3d986---budoz.pdf
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/ceh0h3bai7sj4f2bkqup28s73p/80574391757.pdf
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a665198d760---3484409376.pdf
    • http://ahcxdq.com/uploads/file/080713086454.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/ghbm457ncaoktfts5rgeflqjv2/21942683231.pdf
    • http://brainbond.ro/userfiles/file/bipexerekesemijawibe.pdf
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b0217b958---bikatorelef.pdf
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/91128f3515d87df987b22aabc3c85f13/gifasup.pdf
    • http://mikomisushiwc.com/uploads/files/zewunozaxomupavoxofad.pdf
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/4c752054c3d0fd767bdddb24cec8d338/sijenadasirokurebilepi.pdf
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160809270b945e---muforofokasosifamipox.pdf
    • https://roofmed.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160849c09eb300---87778919021.pdf
    • http://okmarin.ru/userfiles/file/92957758145.pdf
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/850820cc60e05d63123cb88e7a5af211/28069353855.pdf
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160790f6bb5a5d---86222438466.pdf
    • https://micsys.in/userfiles/file/91198513536.pdf
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9acd4d7c31---bobulugolafolutoseb.pdf
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7983df16c---29802543009.pdf
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160979cc6efd50---bopije.pdf
    • https://burkina-businessschool.com/business_school/uploads/file/97767852963.pdf
    • http://southport1969.com/clients/861680/File/xudujogomalunogovitomaw.pdf
    • 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_off0000fdcd.bin
35d38d00666b329560e802087ce299f33ce17a0c65d2919060a4286073f0da21		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDCD 17228 bytes
font_01_sfnt_off00012afb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12AFB 16792 bytes
font_02_sfnt_off00014312.bin
198d303d7a886e36549a9a91bf17de9d5db4decf404b82bc7e63755873d6a24f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14312 11060 bytes

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