Malicious PDF — malware analysis report

Static analysis result for SHA-256 7355d8403e7161bd…

MALICIOUS

PDF

90.9 KB Created: 2021-07-31 10:13:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8113f3d5c12e5046788501875e34f52c SHA-1: d095cec0f11fda0817358b2ff64d3f6f47c077c3 SHA-256: 7355d8403e7161bd1c4fdc978536d6fcc8a9f162176984d03211b3d5175d8a47
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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, containing numerous embedded URLs that point to various websites, including those hosted on compromised WordPress installations. The presence of these links suggests the file is likely used for phishing or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://inwebjor.ru/uplcv?utm_term=abominable+movie+stream+free PDF link annotation
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a3cceceff7e---83770104629.pdfIn PDF document text
    • https://priscar.com/documents/files/palawubopajelepavimarexob.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16088d0b37b00b---74769881700.pdfIn PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/zapes.pdfIn PDF document text
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/58fecc33b13948e45cf66809ffc6f3f9/fuzodudasejuno.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c87787dce0f---8271727334.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/fbd57d235703c140d291191b86b460e9/7590059184.pdfIn PDF document text
    • https://ever-progress.com/upload/files/wejidopuxujadenawif.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/bfblv072hl7unkgp9hn8u2mm31/60814970563.pdfIn PDF document text
    • https://cosmeticdermatologymiamibeach.com/uploads/data/files/79481335420.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/gelawewepomavowis.pdfIn PDF document text
    • http://petrduchek.com/files/14245057892.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/repufuk.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087e4b33e190---50836647090.pdfIn PDF document text
    • http://jirehenl.com/userfiles/file/130617349318.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16084253d7441f---63008566799.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/nibiruratoxevuwixewigav.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/3a38686cb0b6d9566c2c8782d848db4b/xilegutame.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160a205f88909a---2801829760.pdfIn PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/mawilopojusumadusofej.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-5-17/20210517175227596642.pdfIn PDF document text
    • https://viettincapital.vn/upload/files/65435655124.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/9e2a75d629e679274a95346408ed7c4d/6376613845.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011552.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11552 10564 bytes
SHA-256: 10825fb979c0de1efb0a4952d6b37e078b06f73deaef903ae7e7243d3d5bb188
font_02_sfnt_off00012d6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D6E 17656 bytes
SHA-256: 0e13124904082cec857d2ec189b48e0ac170deed7e2de386a3012f8b016cccb8