Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffb398122d55e61d…

MALICIOUS

PDF

90.5 KB Created: 2021-07-05 02:59:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 6d04b3523678431cd2d24f53ecef1419 SHA-1: 6ac6adcee14fc463b228e825c8ec589a826abe4c SHA-256: ffb398122d55e61d32d56a78d6c80bafa696cfaa4096ebd3594c4192bdea2b22
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 functions as a link farm, containing numerous URLs pointing to potentially compromised websites or phishing lures, such as 'synerhu.ru'. The presence of multiple links on disposable hosting and compromised CMS uploads suggests an attempt to distribute malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://synerhu.ru/uplcv?utm_term=ethiopian+food+delivery PDF link annotation
    • https://almondzwealth.com/administrator/imagetemp/file/53171912527.pdfIn PDF document text
    • https://boumqueur-edition.com/upload/fckeditor/file/zodepagemituzop.pdfIn PDF document text
    • http://eachfun.com/ckfinder/userfiles/site_eachfun_com/files/vawazamajinope.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080def506bc4---kiwaxodopesop.pdfIn PDF document text
    • http://highlandhighclassof1962.com/clients/c/c3/c330a44b04b080977bf299ea430a317d/File/54171838973.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16079bf65edf87---94530386426.pdfIn PDF document text
    • http://ck-kutnahora.cz/gais/image/file/8379783439.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/7e163aa1f0d78751e90d22f6797c5f09/94391572907.pdfIn PDF document text
    • http://skikk.nl/app/webroot/files/userfiles/files/noxavopomorunededarum.pdfIn PDF document text
    • https://chris-arnold.com/userfiles/file/zozoneririn.pdfIn PDF document text
    • https://computerzone.pk/file/76610676622.pdfIn PDF document text
    • http://www.pzkexie.com/up_files/file/50240043418.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/3ca787975f6c7e84868462303023d77b/67747863075.pdfIn PDF document text
    • http://gw73patriots.com/clients/1/1e/1ed986c9d410becccfd9995a8318e329/File/darasitekug.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/a9ca9c4f81ff12534819882d10688ff2/vifuledovatejoxop.pdfIn PDF document text
    • https://melz-feu.ru/upload/wifojalitesesidabudu.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/981642d56fa342cdd011b60d3deb8e6d/simipisibexobovivalegij.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/63825191419.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8854bb92cf---webopa.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/nej921ph45i7ulm8ld4qnmk1m1/93767393921.pdfIn PDF document text
    • http://womenwhorockarkansas.com/clients/4/4c/4cfcdabbb7b8ad81bafe9a4295858145/File/magobagobuvuvuwixe.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/d63b438a638c8a4bf74aacc1f1fc080c/fejis.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/87d3inc15pbo201eaqjhe0lntj/xakolizupalololutugarit.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_off0000ffe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE3 17240 bytes
SHA-256: e7e30436ef05fbac0376e332b252ef07700c73b2e2ba0bdd97174df1a246d2d3
font_01_sfnt_off00012cb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000144c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144C9 10588 bytes
SHA-256: b4fecb864f4403ab307d8933151cf02690e91c1b8bc850d06e74121dfdc5fba9

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