Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cae70c00bfb0462…

MALICIOUS

PDF

73.4 KB Created: 2021-09-02 04:34:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 02140e6ef6695535a2022281045eb9fd SHA-1: a9d2aacff6c8d8ddbc601e85d8682f5a41cc0587 SHA-256: 0cae70c00bfb0462d81faa0cbcc55feadb5bb93a19049ebcf7a40984d38c8b4a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URI heuristics and link farm indicators confirms the document's purpose is to redirect users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://pistant.ru/uplcv?utm_term=withholding+tax+2021 PDF link annotation
    • https://www.ccs-corporation.com/ckfinder/userfiles/files/rogajopuv.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/90997584442.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ab377e73a88---pakolevunej.pdfIn PDF document text
    • https://zhansq.cn/upload/file/98059084900.pdfIn PDF document text
    • https://md-bud.pl/szklo/photos/file/66443216479.pdfIn PDF document text
    • https://tagoproperties.com/ckfinder/userfiles/files/jifoxid.pdfIn PDF document text
    • https://tavcam.com/upload/ckfinder/files/dozokiro.pdfIn PDF document text
    • http://tsrmmessina.it/userfiles/files/nitusonobixiguzudejozaw.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/60564017759.pdfIn PDF document text
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/ab3a5986f2b0f28dcaabcb597b98d3b3/mefewisiguvudine.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/vakolejepuvavagab.pdfIn PDF document text
    • http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/39900838401.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a18ad710e45---47717787600.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f461363567---gubegujalu.pdfIn PDF document text
    • http://ruresept.ru/files/file/32522608191.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/51dcafce8f5ed6ec409821c181025cc1/nikinowelinur.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/7f15ffdd3b27acf78244ecafe5cb467b/xegefujevevugin.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/2a604436e659701adf577b7d5cf6784d/66583911945.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/692d2a9347f2414c182ba08e3ddefdc3/mitimirisixo.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1610cef8a9f5d5---relarebubuv.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/vakanukelewepuribe.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16098753d246fb---nejokafapasenowusol.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba5d7f23840---ratupufesar.pdfIn PDF document text
    • http://deltools.com/userfiles/file/94213434080.pdfIn PDF document text
    • http://carrasvilla.es/uploads/files/gololabileperoki.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_off0000bed2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBED2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d6e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E9 10516 bytes
SHA-256: a166858898c56209226f914b0cf550026dc841490c25eb6bc9fdc95aabc356a3
font_02_sfnt_off0000eea1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA1 15804 bytes
SHA-256: ecb201ef2137ffa235bc96b2b3a30a61d083ab4862c84bd518fce15444bd2382

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