Malicious PDF — malware analysis report

Static analysis result for SHA-256 26b4fcd85b87c97b…

MALICIOUS

PDF

83.4 KB Created: 2021-09-02 08:24:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 97dde58a2fc49bbdab547b4d421b1b3f SHA-1: b3ec1509b88f43c3234e69d899207c40138d1cd9 SHA-256: 26b4fcd85b87c97b3be41a2e578768b6ce89efc0e4b2f16e45a64a56990cb9de
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. Numerous heuristics indicate the PDF functions as a link farm, with many external URIs pointing to potentially compromised websites or disposable hosting. The primary purpose appears to be directing users to external content, which is a common tactic for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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=the+book+thief+max+and+liesel PDF link annotation
    • http://domeinbeverdonk.be/assets/files/file/defuvawewu.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160b266d0b0c43---wutopizupapirasi.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/edbeffb61ffcb3a3ead40a5915dc399b/37660180422.pdfIn PDF document text
    • http://ntouioc.ntou.edu.tw/ckfinder/userfiles/files/68252477047.pdfIn PDF document text
    • https://czus-lukasa.sk/userfiles/file/werupojilun.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/jpno8rc4qd71a64qgspdnc3v8m/buliwuzukukireg.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/wexopavabugibujidokumo.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081ac72b88a9---buzusamimuxo.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609111ca35eb8---75228997962.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612b5b4f7f183---61258450049.pdfIn PDF document text
    • http://tsnpharma.com/upload/files/31239366885.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/d1c3104bc949129cc3feee47f170bc4c/tabuj.pdfIn PDF document text
    • http://seyrimerdin.com/userfiles/file/xekilinobakom.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cf340d48ceb---jejozuxogizanidunubarigi.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/711337052.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/ufe2hldomhc46dh9kt0vvo58d5/68826052484.pdfIn PDF document text
    • http://1mosref.ru/ckfinder/userfiles/files/wegokakatolatalunibo.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/4c275e1b5c93ba8ac13233f509dd0247/rewojilaxig.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-7-28/20210728082841650753.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/8839e0e19a2b0077d5a0b722ce1ecbe7/1990240755.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/94a9d1844c30e0e93ce2673571301c90/vojivew.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_off0000dfa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA2 18656 bytes
SHA-256: 82886b9669a55effe8207fe3793933ee69885217678dafd2bd26355fcf609519
font_01_sfnt_off00010f78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001278f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1278F 10816 bytes
SHA-256: 9087399f4af2a3af30832f3e36d43ccdb63aa4e9e0aaffa200afa427c960cc7f

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