Malicious PDF — malware analysis report

Static analysis result for SHA-256 db8c3029e79570f9…

MALICIOUS

PDF

78.6 KB Created: 2021-07-02 14:15:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 11f06082db799986f6b2a45f222e9eb4 SHA-1: bacc395ea3cc7bdd65cdbd096af5e27cfe7a1dd7 SHA-256: db8c3029e79570f9c3bc14c543188c05eefd1563e612bd8f833b6278f68570f6
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 contains numerous external URIs and links to compromised WordPress upload storage, suggesting it functions as a phishing lure or a link farm to distribute further malicious content. The presence of embedded URLs and the nature of the heuristics point towards a phishing attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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=2+dessert+spoons+equal+1+tablespoon PDF link annotation
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/75302da4b07b2eb185728071e2bb91a7/23344716606.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160767358c1ce8---15676027299.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/n5ts14jadajsi3vmilifbn3336/fejenawipanepexijoj.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/0ab0afdaeb7e65bf1ab7d3faa21d64db/xepoxedawototodogutasoni.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078606bc8836---diwafimuroxigogux.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/36920381035.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160916f3fd5f8e---povitobixevimanin.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/52e0eb848eff245a0cb2d6f113374f93/70647118627.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/2894fdc8f4d6ee1abf08c15472644200/pasowiga.pdfIn PDF document text
    • https://mecaniquekd.ca/upload/file/gofixu.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/1412no9of2kvin73u7tbv2blj1/tomatobevavebolafuwote.pdfIn PDF document text
    • http://blesk-stroy.ru/userfiles/files/dumutuxobutovagemore.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/mojuwi.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/f067e885619f019fef14709550d534ef/tudatuzabufusevodakag.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c5d7032f3d---68706589107.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d28b64204---mutiruleraparisavasiz.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8ce882242---wigedabuzamotowa.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/zoxawine.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/5366691691.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/8ce2f2faa6a9c361c873aafbbe1dd992/wurotoji.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c718c44b238---25981255576.pdfIn PDF document text
    • http://carrozzeriardue.it/userfiles/files/xixaxexoxaxoxapofij.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/29496652151.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF25 10752 bytes
SHA-256: 1cd28c904c95e6056c33ed4308bf2844f82862aa4d5191aa179bd9c9e2c1d1c4
font_01_sfnt_off0000e79d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE79D 16820 bytes
SHA-256: fa3188e9776f41a50d929a2da84f26290a455c74d38f332a08fa2f5eeb49dfbf
font_02_sfnt_off00011321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11321 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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