Malicious PDF — malware analysis report

Static analysis result for SHA-256 658fb4bd3e76b11a…

MALICIOUS

PDF

92.5 KB Created: 2021-09-21 00:34:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 23b23bee05a8a4ef6cbc37a8df3a5602 SHA-1: 58eaba0b46a68cbd356109fd0a62a2e2e9d73219 SHA-256: 658fb4bd3e76b11aa3e022570385aa6ea443f4ac3cb9620e229e47d1b83a7a93
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is unreadable, but the heuristics and URL analysis strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://madmojo.com/fckupload/file/zutilafaduk.pdf In PDF document text
    • https://gopherscopes.com/userfiles/file/65578027843.pdfIn PDF document text
    • http://klick-tipp.at/ckfinder/userfiles/publics/files/13002113213.pdfIn PDF document text
    • http://kanomax-nsk.ru/images/tolasidakajebixudukoji.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4af6107c28ec51b6d67bdeeefe45bb61/25316197163.pdfIn PDF document text
    • http://transgusto.ch/userfiles/file/sibinenika.pdfIn PDF document text
    • https://tele-video.ru/upload/files/dukatugunukosofuzejadajaf.pdfIn PDF document text
    • http://lesmashclub.com/imgUpload/files/79942805839.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/6687805705.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/bekijuritukokevexa.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec276a43f7---65791374105.pdfIn PDF document text
    • http://gabortech.com/admin/file/kafuponupafolif.pdfIn PDF document text
    • https://newegys.egyseg.eu/ckfinder/userfiles/files/33448403704.pdfIn PDF document text
    • http://hydrogears.com/survey/userfiles/files/54447206190.pdfIn PDF document text
    • http://soluzionebenessere.eu/userfiles/files/9633580255.pdfIn PDF document text
    • http://ibrahimabuomira.com/ckeditor/ckfinder/userfiles/files/16013652701.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca7bdc3c19---wasewavowevujozad.pdfIn PDF document text
    • https://ku4ysk-9lgp4y.com/contents/files/25495123683.pdfIn PDF document text
    • http://ansatrans.ru/admin/ckfinder/userfiles/files/tinakimugukus.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/u8436vqq8tsj91smm3oo5d8uq3/zozizafitud.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142ec1fcceb3---28601302871.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148fae145c80---jelarezokebosaw.pdfIn PDF document text
    • http://china-zub.ru/userfiles/file/bagazunilolejopifalidax.pdfIn PDF document text
    • http://hasanmasat.com/ckfinder/userfiles/files/4197800597.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=textual+commentary+on+the+greek+new+testament+pdfPDF 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_off0000fb01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB01 21052 bytes
SHA-256: 9247a103a5f11379a7e6453efa08f8e8490efe105382367aba9602af754bca2b
font_01_sfnt_off00013177.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13177 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001498e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1498E 11432 bytes
SHA-256: 4e3309c6515d17728c6f9c34f415a0a478aa642acc0bd29f97e9b8c2e87a4d6f