Malicious PDF — malware analysis report

Static analysis result for SHA-256 3610261949b0ba84…

MALICIOUS

PDF

111.2 KB Created: 2021-07-05 00:06:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5b6cfef558299571924947cb5fe999f5 SHA-1: fc2df55d562c29109e2dd2331d6390b8ec84dcaf SHA-256: 3610261949b0ba84a2f9d17601e7ca16c6574ff3ddc339a8b397908b0a0fe02b
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. It contains numerous links pointing to compromised WordPress sites and other domains, suggesting a phishing or malware distribution campaign. The presence of external URIs and link farms indicates an attempt to redirect the user to malicious content hosted on these sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9330

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://medvor.ru/uplcv?utm_term=inverted+cross+emoji+copy+and+paste
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c15a8a360bd---225955183.pdf
    • http://qtjdb.com/UploadFile/2021/05/24/file/20210524_230918_160.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608824ed1b8e7---47827138288.pdf
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085686f8c795---91878975926.pdf
    • http://beastyenergy.com/userfiles/file/85193936808.pdf
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160afa6b526303---natibizivig.pdf
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/23661400771.pdf
    • http://heldermusic.nl/ckfinder/userfiles/files/21849899819.pdf
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/cq2rfo8plbq97ha2r2pua8v8dj/fimemu.pdf
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/km7bdajq6uld1gdkbq28simq4t/paxodoba.pdf
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/24a48647f4bf27da0eafdc7b9eac7d2f/ligetafepiwazegibe.pdf
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/37833a873d15c72ea05c6f82aad22303/fixotufugodegofepakej.pdf
    • http://ankamet.com/userfiles/file/38085704095.pdf
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609ecb8ca5ff0---gitasulepovoxupovo.pdf
    • http://brnc85.com/clients/878796/File/59790678438.pdf
    • http://grodgolf.com/clients/f/fd/fd83fa7079552abb47853a85229f74c1/File/91783955563.pdf
    • https://kermoulin.com/userfiles/file/susurafefomurotugijumoz.pdf
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085ad6ac0dfb---rodebinaduwevozamiw.pdf
    • https://istanajp2.com/contents//files/sesoxixowulibubofawilagen.pdf
    • http://hiddencliff.kr/FileData/ckfinder/files/20210701_45CE3995116B4896.pdf
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c94c0a29b05---99856408297.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/625f58dc437846cd40cfebb9f482a2a8/vamazalabodabu.pdf
    • http://www.ortodonciaelisafarache.com/ckfinder/userfiles/files/lagiwakazesozuzedediti.pdf
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/87c8cf59d8d2be9fa9cb284a4a6cbb9a/bitifolesusivojovabogidal.pdf
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/f2c2759281415e65beece299b824984d/kosadowonix.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e971f6f5ee---65907536695.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edff.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFF 16792 bytes
font_01_sfnt_off00010611.bin
a2179986bf35d0b4aa32b5196e8ddbd9246184403162d65e0db3b0479a50c18f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10611 27624 bytes
font_02_sfnt_off000150b6.bin
3f30313d6b69c6009a59ac801e528448c3117aafc13732dd0118d77f50969ae6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x150B6 9036 bytes
font_03_sfnt_off00016385.bin
d901597388c1a3f0dca82b2e5841abd62babadb4615e9a58c717340a1a014d70		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16385 10892 bytes
font_04_sfnt_off00017caf.bin
823240510012308c686a7fac453d1a5b9aaedcd9bab4a23ea296a712c6e34b92		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17CAF 24912 bytes

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