Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd6650ddc8eda148…

MALICIOUS

PDF

112.7 KB Created: 2021-09-04 18:07:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 29206dc2c42036b679557b47a369b7b5 SHA-1: f87dd2783487ae4963474230c0ed006821bdc2df SHA-256: cd6650ddc8eda14876f73917bc6674794b0468d0602c1faca2d4fc8517e9f532
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It contains numerous links pointing to compromised websites and link farms, suggesting an intent to redirect users to malicious content. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a focus on external link distribution, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://laborke.ru/uplcv?utm_term=rubix+cube+formula+3x3+pdf PDF link annotation
    • http://aaaexpressheating.com/userfiles/file/lufigulozejitoluwebizot.pdfIn PDF document text
    • http://netmutum.com/userfiles/file/40809089729.pdfIn PDF document text
    • https://www.uflo.edu.ar/ckfinder/archivos/documentos/3168125974.pdfIn PDF document text
    • http://shopabrang.com/images/files/18562095544.pdfIn PDF document text
    • https://jxlmedu.com/file/files/20210825_034834.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/tusawajowevadelali.pdfIn PDF document text
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/a8s9emc7foslfa4iq6fqqj06e5/jizijefepovebojuzutaxem.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609822a12de4f---nijelategiwowu.pdfIn PDF document text
    • https://pacantioquia.org/aym_image/files/75789352921.pdfIn PDF document text
    • http://pnalog.ru/images/file/vajidifo.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/01860310ec9abc75d2886b519e8277a6/rudavopigafe.pdfIn PDF document text
    • http://depcip.com/app/views/panel/ckfinder/userfiles/files/rofolagimesozuraburetewa.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608221f11b887---53615794425.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/pejigefekatuvasolojuga.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021043023285573499.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087fe44460eb---gotidonupo.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/098875e23636e9047f038946473146b0/45257160150.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/xumudazelamozusijeleladi.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/7503f5a0fece98222758e1863c9d64cf/90917706289.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/9gb0are07jthjm6hc2gtesv1e2/zofuronemato.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a84cddb872---zaginozupa.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/c03ab86e7716176b8a187dabccfdae85/sevarusegikix.pdfIn PDF document text
    • http://matchedtubes.de/userfiles/file/71762045266.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_off00014b2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B2B 10972 bytes
SHA-256: a197858049752049e12222f30062df79336e9cb3cb0c0d6e14afda29c7d06376
font_01_sfnt_off0001646c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1646C 21696 bytes
SHA-256: 7f6aca8012c150f8930b0d928bd278e8aeb8042b6ddd1e6619c915179575a02b
font_02_sfnt_off00019d29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19D29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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