Malicious PDF — malware analysis report

Static analysis result for SHA-256 55d15a2fff36da08…

MALICIOUS

PDF

75.8 KB Created: 2021-09-06 14:54:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f93ed2bddcbbc2132f46cf0d94a410ec SHA-1: 19db8f88fe5fab4e285e6719a0e6303531e2a6ea SHA-256: 55d15a2fff36da0822dda8558f871587def53b785542d83d88dca27277e04ab6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high ML score and ClamAV detection. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of embedded URLs and the nature of the heuristics indicate a likely attempt to redirect users to malicious sites, potentially for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607c66b211cbb---25409350174.pdf In PDF document text
    • http://kamennykoberec.eu/editor_uploads/system/files/puxajoxewo.pdfIn PDF document text
    • http://huthamcauquanggiap.com/upload/files/pugusewutavamif.pdfIn PDF document text
    • http://tutaylamhet.com/storage/ckfinder/files/tadetiwiriru.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160afab8a27764---nodamurezozerodevujatido.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608b761f8de63---voruvovizurevijiwafor.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/d395cbf2fbce2cebcd8fdd75e2376bf7/darufaputu.pdfIn PDF document text
    • https://www.gurgy.net/ckfinder/userfiles/files/xaxomovonizepa.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/0neiqin3r9dcmsd8kmudlcg3ru/46369784733.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/futazolevexinog.pdfIn PDF document text
    • https://sensesgrouphk.com/louis/STARKGROUP/ckfinder/userfiles/files/40403072239.pdfIn PDF document text
    • https://majubesar.net/contents//files/31333427323.pdfIn PDF document text
    • http://studiosiciliani.eu/userfiles/files/lepolumomopapewisolo.pdfIn PDF document text
    • http://bookblog.kr/data/file//files/28056244244.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/d19c2899e0dd13ff1b010e7abef5dd31/52019857332.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/503fb973de3f91248d6be47f8ff23179/33162538936.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d52866e1ea---xunoxuwabaku.pdfIn PDF document text
    • http://tsradviseurs.nl/mailing/images/photo/file/latiz.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/2c717345a7907db6c0c8635422001d2b/porikezon.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/neromapela.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/359a2579a9919d5777e7678b866f151c/75824637592.pdfIn PDF document text
    • https://twinslock.com/ckfinder/userfiles/files/29594307430.pdfIn PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/fabazemonizojubikula.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=partial+differentiation+problems+and+solutions+pdfPDF link annotation
    • 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_off0000c403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC403 10900 bytes
SHA-256: 6d0c8ceaa06bfa43d953c0cd3e9e3f867328135a115d43c3f701719bc9bbb084
font_01_sfnt_off0000dcef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCEF 17176 bytes
SHA-256: bae52399c4e23ddadd113fa3d188a2929a007b346c3336e533f9fd14397ca5f9
font_02_sfnt_off000108ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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