Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f289c538a19f1c1…

MALICIOUS

PDF

74.5 KB Created: 2021-07-06 22:52:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 98ee7fbe42f5a647f0d9cd814176c4dd SHA-1: fd1ee901e6f216f78eff781c38b43a9a1e96e637 SHA-256: 4f289c538a19f1c10ffc2a95034004cc0fd43ce9dfca2fe1c986dc87b0bbcb9c
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, directing users to multiple compromised websites, likely to host further malicious content or phishing pages. The presence of numerous links on disposable or compromised hosting reinforces its role as a distribution point for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/3idvjd67bpp70c2v9nvksktr8b/57971588329.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/u3poqmkr28vrnsnchh4fd49a2v/sibojesoxezonuludir.pdf
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160890b33a1356---narubilamo.pdf
    • http://tvkinter.com/file_media/file_image/file/97521916237.pdf
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/luhj8e78cp3lponpj2667asql1/24057170788.pdf
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9e922c208---betesapuxewopasinuku.pdf
    • http://bajajsports.com/userfiles/file/pitodafafubawolo.pdf
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/748a6ae9ef027559c88d3050046679be/48578364675.pdf
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea3f077512---duvojezudosalogu.pdf
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1609831576f0d7---11806457246.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ntjkg1rf9ltd3j3l035covfd60/74659894630.pdf
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa24ea33e90---95474724147.pdf
    • http://ebiocell.com/uploadfile/file///2021062804043220.pdf
    • https://nbtele.com/en/cache/fck_files/file/jevawej.pdf
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/653b9c23c806360200ed725d2762b739/tapimidorigevume.pdf
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160897e2b47c6e---56481734269.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/369a73a1cc32489a8886c4e15eceb31d/vixuwivoromowurekenoto.pdf
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607085b18ef68---98379210042.pdf
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f9c82c5e8f---wulopubanesaxugopej.pdf
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/c1c0589d654d8ad47d0d24341deade58/1360321939.pdf
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4674f1e6d8---30777123649.pdf
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d635bb27f8c---fidunanipekikinuda.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=an+introduction+to+boundary+layer+meteorology+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_off0000c1a9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC1A9 16792 bytes
font_01_sfnt_off0000d9bb.bin
41cfc8ac55402a63351eb7ec1c3ace55dc46e71057a83580a8ff05a3755e04d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD9BB 16348 bytes
font_02_sfnt_off000102f1.bin
8a3163e046dfec124631f8b56b746f63171c077863f2406486e28830230e5079		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102F1 11132 bytes

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