Malicious PDF — malware analysis report

Static analysis result for SHA-256 788dd8c33b692576…

MALICIOUS

PDF

84.8 KB Created: 2021-09-05 15:54:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c3726fd26aa88a746b10e20af4086826 SHA-1: 6a8b6fe48f4b0793ec117a65b6e23e3a550a4884 SHA-256: 788dd8c33b692576a12f7f6500b3c2f62a8db8b0dc1c4ef4258ab3d3a68a6396
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for Pdf.Phishing.Trojan and an ML classifier indicating maliciousness. It contains numerous external URIs and links to compromised WordPress upload storage, suggesting it is part of a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://catamma.ru/uplcv?utm_term=english+colors+worksheet+pdf PDF link annotation
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/16a51596a174f79bbda6f3606239b37b/wuwanatudapipoziw.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/5d735e2c821144cbf58705f97b522456/54415321886.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/watejaviligevo.pdfIn PDF document text
    • https://socohoteldanang.com/uploads/image/files/dojesosudotowakoxijexuzi.pdfIn PDF document text
    • http://elisa5888.com/shopadmin/upload/files/vujukabi.pdfIn PDF document text
    • http://phamtrangia.com/upload/files/75718998657.pdfIn PDF document text
    • http://xn--9d0b102a6wc3y4a.com/sa_upload/userfiles/file/20210630005011.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/474fcf882fe19ac8538534299bdcb35f/vadirelepur.pdfIn PDF document text
    • http://vimar.ua/userfiles/files/vazudibozetexamo.pdfIn PDF document text
    • https://rumputhijau.com/contents//files/8481302680.pdfIn PDF document text
    • http://mesterek.net/tmp/97635047067.pdfIn PDF document text
    • https://ka-base.no/images_content/file/vuzanotuzudesusumaxuxexes.pdfIn PDF document text
    • https://mimpiindah2.com/contents//files/89219146342.pdfIn PDF document text
    • http://kondicionery-domodedovo.ru/upload_picture/file/wokagebidisuzo.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/rumotozemibofijonufi.pdfIn PDF document text
    • http://baohanhranghm.com/upload/img/files/10589395952.pdfIn PDF document text
    • https://mimpishiosatu.com/contents//files/9914163005.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079c5c6730fa---tapurijewoxujutigev.pdfIn PDF document text
    • http://biomisszio.hu/tmp/nilogisadeder.pdfIn PDF document text
    • http://bigxra.com/uploadfile/file/2021061102104573499.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/wejedoruvuwugeropazawi.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161294b69a2585---fikivalobafuxenuwakuge.pdfIn PDF document text
    • http://citywideok.com/clients/75789/File/74934226186.pdfIn PDF document text
    • http://medlab.webd.pl/upload/file/gexaveja.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_off0000e55c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE55C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD73 10896 bytes
SHA-256: bdaecfe46a418de27a26875564ff31246cf4ea441f07bb47fac8bad304ab12f7
font_02_sfnt_off0001166e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1166E 18216 bytes
SHA-256: a45275b6fb4bd611828b4d67f58667d736749ad436d768c81be0313f31f94752

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