Malicious PDF — malware analysis report

Static analysis result for SHA-256 56bc2070d4d10f16…

MALICIOUS

PDF

88.2 KB Created: 2021-08-02 22:04:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 374008267f3dda395448dcf5d1c39be4 SHA-1: 6d33d725e67e3faa967e920c563cfcbb4dafff0e SHA-256: 56bc2070d4d10f16920d0597f94fc6a92660cf67cb232c082692c287e2c171f8
156 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to various websites, many of which appear to be hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO spam. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c87c889497---womasumadinibelatidezit.pdf In PDF document text
    • https://vietucmould.com/img-vietuc/files/79896938215.pdfIn PDF document text
    • http://didula.com/img/file/juvuzema.pdfIn PDF document text
    • http://shukokai-voves.fr/userfiles/file/juviduzedelerajuwipugaso.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/b31072c3c1042e61f94e54ec353e764a/80601924680.pdfIn PDF document text
    • https://irantruck.ir/data/file/xixaporiw.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/sodebasivarik.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160896db3f3182---17858701083.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/4a488c5e99484eaf21760923a25f1666/24796044752.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160849b35dfa6e---45939465393.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/e6d0757d853551a37e233ec01e731107/57491689392.pdfIn PDF document text
    • http://ecogestval.com/userfiles/file/pexasuniregevubixobewe.pdfIn PDF document text
    • http://salkim.com/userfiles/file/8890951690.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/vuborodo.pdfIn PDF document text
    • http://chrisdepanneservices.fr/Sites/cds/files/tisogezenamunejusiv.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160a7aac7de56b---50967540177.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/u811drhf4rph30cmlhpd1n2hl7/nuzewarulikaseleveniki.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/39409824768.pdfIn PDF document text
    • http://ypcalumni.com/clients/2/24/24042806289e0d450134266962f0a0d8/File/71851715839.pdfIn PDF document text
    • http://somsit.com/ckfinder/userfiles/files/94542487709.pdfIn PDF document text
    • https://questyme.com/userfiles/file/vamumoditivilumo.pdfIn PDF document text
    • https://www.groupenahno.com/wp-content/plugins/super-forms/uploads/php/files/jl5se8rutbl95nvgkporu92fsr/sapirosuto.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b4f5cbd57---30884958492.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/5c8e29048c6adb4d44461e5b2546f22a/kopaz.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/e6cc6bc3d639868c6e2a891b2a2936a1/88827219113.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+install+windows+10+on+unsupported+mac+without+bootcampPDF 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_off0000f274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF274 11272 bytes
SHA-256: e7524beccd6d7afa7aa1fc12459413ceaca1084a87e24aaa3a6cb9eb83b9d688
font_01_sfnt_off00010c88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C88 16860 bytes
SHA-256: 65b25d168cadcf354e26a4ed8be738a179ec41d8b55baf17703950c18f2b1fa4
font_02_sfnt_off00013892.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13892 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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