Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a1bd760cc7dc757…

MALICIOUS

PDF

96.9 KB Created: 2021-09-02 02:29:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cbf5c822009f1966296351b9f0271564 SHA-1: bec5e87f278e1087cf730eb16116e4ece60e985f SHA-256: 2a1bd760cc7dc75706a5fd3d3271c662419a59a6b9a125e6f2a4cb5dfd0b9be1
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, identified as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ba9cabfe7---pugakazo.pdf In PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16082c932e2c24---migolixiworemirosipiv.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611a0ee2d6537---14503861838.pdfIn PDF document text
    • http://wohingltd.com/userfiles/80610874146.pdfIn PDF document text
    • http://vote4dannybarry.com/clients/2/2f/2f5d4f67c16906f9b09010289963de11/File/rejazinawipixola.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16125e3ac17b7f---tutelamupigabovunaluv.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/6e988d0f781d630e48e32d120f8d3548/tigezufakodasilirunekuza.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d27340bff0---kozimimalesuteguziba.pdfIn PDF document text
    • https://coevent.ru/upload/files/zujif.pdfIn PDF document text
    • http://mamolenasnc.it/userfiles/files/902698025.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/moxiwulegin.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8fb36b6b57---zobezokanej.pdfIn PDF document text
    • http://www.greenfield-sustainability.com/images/files/zezufipozefikufizow.pdfIn PDF document text
    • http://deshdunya.com/blogimage/file/jokugofitojitekowexulexut.pdfIn PDF document text
    • https://maxflowfans.com/userfiles/file/jugegelu.pdfIn PDF document text
    • http://keramann.ru/uploads/files/29653290894.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160758a7177b4e---wunedebaxut.pdfIn PDF document text
    • http://cerescommoditiesltd.com/Images_upload/files/bafekomirukiwa.pdfIn PDF document text
    • https://fonixkoncert.hu/upload/file/renuwikomejamopa.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/7s4b30eug3o2l2rm606e3qseq5/92513743260.pdfIn PDF document text
    • http://perilatomsk.ru/ckfinder/userfiles/files/37052589063.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b8109836c12---ruboxepu.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/81253164663.pdfIn PDF document text
    • http://ekonopuntos.com/campannas/file/jitilewezizufiriz.pdfIn PDF document text
    • https://arket.io/wp-content/plugins/super-forms/uploads/php/files/6nepnb18b0d4me45m0c3mr3o2d/10101790421.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/pesonulatenel.pdfIn PDF document text
    • http://bartuceviri.com/userfiles/file/49674356842.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/58458180529.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=financial+accounting+introduction+pptPDF 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_off000113c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113C6 10464 bytes
SHA-256: da53187494f53f79ada0daa78fa304aa5de609e30efdadff4cf5b89de7be4fee
font_01_sfnt_off00012b5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B5E 18920 bytes
SHA-256: 915aadee49f2e66ec9d0091d2817686bff1a3aa38b2732591cdb05be7d47e493
font_02_sfnt_off00015c8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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