Malicious PDF — malware analysis report

Static analysis result for SHA-256 99c36e2bfca93351…

MALICIOUS

PDF

102.8 KB Created: 2021-08-02 15:49:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c141cc1306428d79a6f2344ffd8ebdee SHA-1: d7f55074404009998c3ff2c32535b3f07a5e4e41 SHA-256: 99c36e2bfca93351a066b4bdb1a3b142615773f350f218573c893005a1937802
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to numerous compromised WordPress upload directories and disposable hosting sites, suggesting it's designed to redirect users to phishing or malware distribution sites. The presence of embedded URLs and the nature of the link farm strongly suggest a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9874

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 http://zaun-produzent.de/userfiles/file/65598617831.pdf In PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/pps3t0f9cbckrea3m3qc4rgusj/gomexebisarupuboniv.pdfIn PDF document text
    • http://franklinbristerharveyfamily.com/clients/a/a8/a8910385c57dfddac3c6311e2bd1422e/File/19649723694.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160bfff3245342---18185466615.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/c4a6aa2133330dbcaa15075c1dfee0a5/32002659579.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/7223494150.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4827b0023---15715396945.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/m7n0tju3a39g4ol7l0cvb6mkih/91552541583.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4cf72785c---newipofivexo.pdfIn PDF document text
    • https://toyotaautobody.com/ckfinder/userfiles/files/72290850034.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/a9127fd7e6d33bbbaf7ad05bcc8a2ac7/fafired.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/c830afadded6cb5a7a0d6bce9d99fa19/86865124321.pdfIn PDF document text
    • https://murtenhof.ch/userfiles/files/simivisawumamanunoniro.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/lufizosirukafonafabigaw.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/15da07752f99a105013af27b079dd26c/48526243031.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/74635932794.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/7b5f038e065efb298f096604638bdb36/52423127589.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a42fe3f0ab3---25340731546.pdfIn PDF document text
    • http://1mosref.ru/ckfinder/userfiles/files/29182549467.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/4718438b449e23cc340f4f75aaeecc09/xuparadufid.pdfIn PDF document text
    • https://jphotographyllc.com/userfiles/file/datuluvewixufajal.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a834485f4c5---xazevanetefufopimokobolud.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160914629c72f5---55706694218.pdfIn PDF document text
    • https://cometsecurity.in/admin/userfiles/file/6634862964.pdfIn PDF document text
    • http://chapmanhighschoolclassof1968.com/clients/c/cb/cb1fed5110c07f199f416a264ee6943c/File/xamidarusudij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=what+the+bible+says+about+respecting+your+wifePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000117be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117BE 11192 bytes
SHA-256: 7af7d7dea1ca8f1dfc88ebfbf58ae387ce58dec2d1cd7d9ad25c1967c867668b
font_01_sfnt_off000131c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131C1 16312 bytes
SHA-256: 7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae
font_02_sfnt_off000147c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147C8 17308 bytes
SHA-256: 3c0ed668444c6b4ee21a61c0fdfd08326baba9bb505d3c6a903e1bf6d8e15602
font_03_sfnt_off000174e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x174E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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