Malicious PDF — malware analysis report

Static analysis result for SHA-256 13b456434dfee66e…

MALICIOUS

PDF

87.8 KB Created: 2021-07-16 12:51:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: aa884ab19e992371627ec2e44ce47abd SHA-1: 1fbd3b7404fdb5c811a7f69091fd22a295380bbe SHA-256: 13b456434dfee66e9eb8970a94e40c391d78ca6de470ec7039c9b9553a14f79b
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or trojan distribution attempt. The document functions as a link farm, with numerous embedded URLs pointing to various websites, some of which are hosted on compromised CMS upload directories. While no scripts were extracted, the structure and URL distribution suggest an intent to lure users to malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://kayapaliinsaat.net/file/15743108017.pdf In PDF document text
    • http://ccspevents.com/clients/24998/File/6415095489.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607998844e6a7---bopunojarupi.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c9005482bf6---zerowidudij.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/77000308625.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160aa865b1f84f---jizunatikozekuzi.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160cf06dd710d2---tixelubazulupu.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/43b0940380d2e67fe79507789882ab19/titumogumerixuzapugejoj.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/55942285852.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/kobizololive.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092cf7c26b25---sofiponipizudujo.pdfIn PDF document text
    • https://responsible-tourism-alliance.com/content_file/files/94031378142.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c664c57ffe---66434745009.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607129ef69a11---66217611500.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077d31e11814---wedemu.pdfIn PDF document text
    • http://sibservis.com/ckfinder/userfiles/files/47993086854.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/rd8vblbktfd8qlg28votk182ic/16410308386.pdfIn PDF document text
    • https://verandapattaya.com/userfiles/files/bigejabepa.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/a6e6c531f95ef438ff28864b7bfec87e/94372139042.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/7b7c9e816051f44315a06005be3c6573/lotoxolezaf.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/96c6f0a899f5768b573a24c93e240a9a/bafowezorifadonajunetoj.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/1423e53e51191ecb718d71f28c938e87/56367440528.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/8c680aba0f9bd6b08964d0dbde41603d/71483852342.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/adbabcf713e9138caec25ea66af09d73/seveligetirizuvejalop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=iit+colleges+in+india+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_off0000f29f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF29F 10648 bytes
SHA-256: 6a0a85038fa7c539de095ba955e9accd007dc222f6491f6254ed1c6eae60b623
font_01_sfnt_off00010add.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ADD 17308 bytes
SHA-256: 137e35ff0db1260ab1cfa8c19328623e97bc9f22d149d29b1f2412a8fd6a7608
font_02_sfnt_off00013853.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13853 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1