Malicious PDF — malware analysis report

Static analysis result for SHA-256 0252e3726cd9c2bb…

MALICIOUS

PDF

87.6 KB Created: 2021-08-17 01:30:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7799565071636d9bb2db87fbb064e820 SHA-1: 4c1d7d60f9df44e2bec4502a0e1edebd7fa8202c SHA-256: 0252e3726cd9c2bb21bad8c20c4eb4195ec2dab12d3acf5e1a8d3ba13860dbfb
156 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs pointing to compromised WordPress upload storage and other disposable hosting sites, indicating a link farm designed to redirect users to malicious content. The presence of these links suggests an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://allytemp.ru/uplcv?utm_term=puntos+de+partida+textbook+pdf PDF link annotation
    • https://uzunlarpeynir.com/dursun/upload/files/judovuxutakew.pdfIn PDF document text
    • http://www.dreamstoreonline.es/ckfinder/userfiles/files/10918905703.pdfIn PDF document text
    • http://prttour.ca/FileData/ckfinder/files/20210621_D89644480308C874.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac92d66ec4b---fosomedadasubaligotubotik.pdfIn PDF document text
    • http://korsorlampang.net/user_img/files/74114384015.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/701344f9bc8ee1e4dbb342a96b03dcf0/50481930927.pdfIn PDF document text
    • http://jentretiens.ch/uploadimage/lubibabubuxa.pdfIn PDF document text
    • http://shadesvalleymounties1969.com/clients/868959/File/mujojekemogaji.pdfIn PDF document text
    • http://permianhighschool1970.com/clients/e/ef/efee9fcbc667252fc4b649c8163d3733/File/xebalesepikotixuperafelog.pdfIn PDF document text
    • https://accounting789.com/ThImg/file/lunigogakiremelamadewub.pdfIn PDF document text
    • http://vintageguitar.ru/ckfinder/userfiles/files/nogowemajerolenibonofe.pdfIn PDF document text
    • https://o2opr.co/userfiles/files/27317047737.pdfIn PDF document text
    • http://vividconcept.in/userfiles/file/jevufavapazod.pdfIn PDF document text
    • http://aygroupmuh.com/image/files/88589235187.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/ea0696de998a5cb59ee4059110b1f667/33181797895.pdfIn PDF document text
    • http://kondicionery-shodnya.ru/upload_picture/file/7269938202.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160703297b7deb---70803326556.pdfIn PDF document text
    • http://kernenshepler.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/feged.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607a301bad931---nibawu.pdfIn PDF document text
    • http://fandimnarodaku.cz/upload/file/vejolusakuwerixep.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/225d28437c9586252732c293c1605665/toxegejup.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e202e58984---zobunavimanofunef.pdfIn PDF document text
    • http://inbjnews.com/data/cheditor/0603/files/84315116755.pdfIn PDF document text
    • https://suadienlanhhanoi.net/upload/files/wivegojiruxigupodirom.pdfIn PDF document text
    • http://arcenevents.nl/site/upload/files/1942000658.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_off0000ef17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF17 18016 bytes
SHA-256: 1a3fcbf69165e0e9608fdb7adec67fc3d1e962bb5ddf13be456fbe740b9252b5
font_01_sfnt_off00011d32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D32 10880 bytes
SHA-256: 14a6c43a74e0aa4721238dcb4abfc3a36e40d64b403c0257542e561b3f65d7ec
font_02_sfnt_off00013652.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13652 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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