Malicious PDF — malware analysis report

Static analysis result for SHA-256 65fc24bec65230ee…

MALICIOUS

PDF

72.9 KB Created: 2021-09-14 08:23:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: db6ca06686b121fde8df28e45ceb73a0 SHA-1: b45183e5c26be93314d6908a21c23a97d541ce7b SHA-256: 65fc24bec65230ee4b8b44dc172d0b4d052d3143cab4b982b81f8f1e60c86b7d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, many pointing to compromised CMS uploads or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing content but serving as a container for the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://drafthe.ru/uplcv?utm_term=how+to+kill+android PDF link annotation
    • http://vntattoosupply.net/uploads/image/files/dotoruwotate.pdfIn PDF document text
    • https://triosms.com/userfiles/file/88982257823.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/13603822616.pdfIn PDF document text
    • https://812423.qqtogeljackpot2.com/contents/files/mukirususapikileriwazu.pdfIn PDF document text
    • https://vroa.pl/chplusfiles/file/53526481817.pdfIn PDF document text
    • http://isitekmuhendislik.com/userfiles/file/79938118902.pdfIn PDF document text
    • https://beta.nhatthiengroup.com/files/uploaded/files/xisovakudojefojupina.pdfIn PDF document text
    • http://sushi-belovo.ru/files/95220895871.pdfIn PDF document text
    • http://babijie.com/upload_fck/file/2021-9-2/20210902034539977886.pdfIn PDF document text
    • http://geotersrl.it/file/venejowupisoliwi.pdfIn PDF document text
    • https://soosekszer.hu/upload/files/gidurelagilijibut.pdfIn PDF document text
    • https://epiphanych.com/images/file/patubatubidu.pdfIn PDF document text
    • http://shahnawazonline.com/uploads/files/botexiz.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613df09318adf---62166663461.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/bf69fe70f2adcee78114a90416a3e5f7/68015953637.pdfIn PDF document text
    • http://xn--franzsischebulldoggen-lec.eu/userfiles/file/41416350463.pdfIn PDF document text
    • http://ty6600.com/userfiles/file/29008016747.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16131c646b5217---3223070847.pdfIn PDF document text
    • http://maimungkorn.com/UserFiles/file/89472625880.pdfIn PDF document text
    • http://csim.jp/ckeditor/uploads/files/zimudisa.pdfIn PDF document text
    • http://j-line.ca/fck_upload/file/bizuxugaragokupudawobutu.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135f2be75589---29116885329.pdfIn PDF document text
    • https://sikahaiphong.com/images/news/files/ziputo.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/ce2a562d5ded1b9ff030f479df756a3b/xozibasogefarizileluzo.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_off0000be2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE2D 16020 bytes
SHA-256: a07f783210079890f803acc12a5fbbcc2f018ed122dc96379e5c259b0bb5a47a
font_01_sfnt_off0000e778.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE778 10108 bytes
SHA-256: bcc373cbc94d82be4addf5e8bfa786c8c10b341c8d694e57f1730f2d4360c16f
font_02_sfnt_off0000fe12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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