Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e210a3d4831790d…

MALICIOUS

PDF

87.7 KB Created: 2021-09-02 00:21:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8bd3bbddb4d4273c433f8e58bb534744 SHA-1: 17ec185a46b150752968477a290d37ad95f4210d SHA-256: 8e210a3d4831790dc1fe7f489d46d4c5d9cd08c06a1b2244fa4a7e5196e51baa
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to disposable or compromised domains. These links likely serve as lures for phishing attacks or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://fgcrubochi.com.ng/ckfinder/userfiles/files/61413923479.pdf In PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4a55c99e0---4945652316.pdfIn PDF document text
    • http://alvitraders.com/files/64101392905.pdfIn PDF document text
    • https://progin.swiss/ckfinder/userfiles/files/6900633230.pdfIn PDF document text
    • http://bartuceviri.com/userfiles/file/wibuketetusumojumibu.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077d9594a855---46580112508.pdfIn PDF document text
    • http://star-transform-moscow.ru/uimg/files/50358697676.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/27843888628.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/pozaxalemo.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/81278410174.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/38273159589.pdfIn PDF document text
    • http://cdseoulps.com/uploadfile/fckeditor/file/84296190021.pdfIn PDF document text
    • http://ranjitabiswas.com/userfiles/files/55050968079.pdfIn PDF document text
    • http://hollywoodterrace.org/clients/863344/File/71881687629.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/e425f6b2994640482cd4e92bf7acc5a1/tusamu.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/16074a9f09bdb2---42363200430.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/c9f6db33bd3df49b2b13b23cf3a81029/disasazajibobetosu.pdfIn PDF document text
    • https://i-intelli.com/ckfinder/userfiles/files/tagidis.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/ritalifamedenabepun.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/gifetoduset.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/ce9ddf7e0237cf38967bc63719c6475a/97627044699.pdfIn PDF document text
    • http://canadanur.com/resimler/files/31804763474.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/16076c5a31347f---69717602012.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=how+do+you+say+awesome+in+spanishPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10408 10704 bytes
SHA-256: 19a772d2fe0fd3a9f82cc44ecb8f4c3152213d6d63138943ecd0c4d9141d1a8c
font_02_sfnt_off00011c5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C5E 20360 bytes
SHA-256: de39d5be6ae6db65c426130c00602a45ef95b4ebac2a26543f04faa6624d8977

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