Malicious PDF — malware analysis report

Static analysis result for SHA-256 77fa54fa4e39b05c…

MALICIOUS

PDF

92.4 KB Created: 2021-08-25 01:42:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: 134cc1fee20a2e5963764bba9fa2ef0e SHA-1: 76f020ee141d2cd8de343acaeceb34d276d2d42a SHA-256: 77fa54fa4e39b05c8f4289b13325ebbd2e5d892fabde5a6e0343250d5002d845
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF structure itself is also flagged for suspicious object definitions, and while no scripts were explicitly extracted, the nature of the URLs and the overall detection suggest it's part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://laborke.ru/uplcv?utm_term=time+expressions+present+simple+and+continuous PDF link annotation
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/c325ae006cc68cb2b9f9732ab936a986/37107966291.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/5206603048.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c96d6b3ed7---muzakalafixibilonobonis.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608001e340222---popodovi.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/puvizipuvijutixibijuw.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/1062913206.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c5723b3f2be---96905234817.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160fb8d42c248f---73468350036.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0b44a93ba---pesapenoluz.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16093cb22b14cb---58458319995.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1609e39e1c3200---96704448016.pdfIn PDF document text
    • http://eotp.info/sites/default/files/fck/file/nadivofudoj.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/58uvd0gfrh6e2fb7kjvt426icp/javegi.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16120216a2ae3e---51098729638.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/bifewazowu.pdfIn PDF document text
    • https://sofupingame.com/calisma2/files/uploads/50353246502.pdfIn PDF document text
    • http://globomax.eu/userfiles/file/belowabimuwenufev.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160beea539cb9a---lawevedudekip.pdfIn PDF document text
    • https://scriptdd.com/_file/file/sixifategufotetojobetuko.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16079594317881---pagajojubed.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/asmi34jg4cnvdq9gmib0pdc4be/raruxibowirojo.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/e95832b8252bf63395830d7dd8238490/digewobitipus.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_off00010478.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10478 17488 bytes
SHA-256: 2d7865622e901b33a0dddd41d4fedd648eee0780c48ce3caba5b00a3e17459f9
font_01_sfnt_off000131c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131C5 10840 bytes
SHA-256: 7ea86c24684082451826ad37925234c24beb5f474cf54dba61c3646e075a9709
font_02_sfnt_off00014aca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14ACA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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