Malicious PDF — malware analysis report

Static analysis result for SHA-256 798b87e5c4163ed4…

MALICIOUS

PDF

93.7 KB Created: 2021-07-01 22:21:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 726738a3ffc5355ddc1bc2ac1a416b89 SHA-1: 9e914aef91ac2a161c049a2017da32f670322572 SHA-256: 798b87e5c4163ed4a658765bfc1ff11326856fe347b50de07bd8f52bb2d7923e
164 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of a 'download button' heuristic further supports the attack pattern of luring users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=creative+multiplication+table PDF link annotation
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/62a878c5cc85951477d2f4b75a98efd9/zakifejiwojetoz.pdfIn PDF document text
    • https://schmitz.cz/res/file/62169437269.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6719995918---fixajupedegugabajukefu.pdfIn PDF document text
    • https://vresponse.net/userfiles/file/gokevuxolidapifes.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/51637076059.pdfIn PDF document text
    • http://lesbambousbleus.fr/ckeditor/upload/files/nagirukosakajinisudaxor.pdfIn PDF document text
    • https://www.webplease.it/wp-content/plugins/super-forms/uploads/php/files/tpirusa4l0ja6j97v8u217m265/82787867789.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b21a1a5646---ginuv.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/4996078d75b524db992d42f0aca67e91/84890599998.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/af0997c777c67fff9033c754e30e0396/pixizopitujezuxutevenawa.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0e0d98a5f---zunosorijoxebur.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/b6b75df5f3ed64255b9f8093f73cd2f7/bonira.pdfIn PDF document text
    • http://podlahypilat.cz/admin/file/22541364292.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/35791c17e753131bd208ea89ef6bd3ba/duriwogipuziruferibujunu.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/48118714426.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/7611c21a4614d09324c83f6f8876a2c7/13621688790.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/qe2kbsg5qslidab25r1e7kt7df/73097113325.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/ig1cusm3oqug9826p50bacen6m/58718672980.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/53722160710.pdfIn PDF document text
    • http://klubalfa.org/img/userfiles/file/55725601842.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/0f7a1caf23512800a573b8d0a3a4823d/68740855554.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_off00010d88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D88 16852 bytes
SHA-256: 10355d777019950e8fcb65100c3fab817af2553df6ea4603e5b77ae3b373e6ba
font_01_sfnt_off00013974.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13974 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001518b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1518B 10704 bytes
SHA-256: 80da60d7e30fb8e926fc74c2ce68a3817d194432c2c9110e3c33fabe8aa9043f

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