Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1be537e0984aecb…

MALICIOUS

PDF

97.1 KB Created: 2021-06-26 09:46:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 1dc0985bd0abe0da9f9668516a1a264e SHA-1: 6f333dcb5b1557273e6ee8085ec7697449ca125f SHA-256: e1be537e0984aecb42b98658bced226d0229acaddc2b742127280fe43c8b827b
176 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it functions as a link farm. The embedded URLs point to compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of numerous links and the use of UTM parameters indicate a deliberate effort to obscure the final destination and potentially track user interactions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://irlanc.ru/uplcv?utm_term=the+rocking+horse+winner+questions+answers PDF link annotation
    • http://alnoorcity.com/userfiles/file/27216124462.pdfIn PDF document text
    • http://ruegen-ferienhaus-schneider.de/userfiles/file/zidujurux.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/88839596266.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c6401cd595---25908666873.pdfPDF link annotation
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/640aa1a10c2d9b82343c9f44147b319c/xiniretorofuges.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7c982dbe0---24728792985.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/b74b1e966d2b746eac97bb556f494d73/suviwavaxefumenewodokuxo.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/33879337333.pdfIn PDF document text
    • http://titadoorbinhduong.com/upload/files/gomeputagamur.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0bfa221d2d---gezuletu.pdfIn PDF document text
    • https://x-software.cz/data/file/44663939171.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160afd8188f1b3---biduvep.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160926ae997f6e---85783419139.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/7e394ae01ba96937f157087452656686/367069275.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/muveledulepirafozeg.pdfIn PDF document text
    • https://starbox.fr/img/files/77196105417.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081e3a4ef307---34125601730.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16087bb3441a91---pubugegareb.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/vawazekopaloviger.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/ceb7a99e00aefe103eb868a0b320912e/80210893927.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091f8acc1bb1---74422050097.pdfIn PDF document text
    • https://monuments-msk.ru/wp-content/plugins/super-forms/uploads/php/files/e41b608eb5b0fab028e130b515c251c9/70043822123.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd1c29262d---kajosija.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/84cb5af05468a254f01aa1a373c35949/57137234282.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9a2ff8b8b5---47201929093.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607887fdd162a---sigosotowa.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_off00011bb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB0 16508 bytes
SHA-256: 1d2d12cf35f3fb01d743e405fb3b3a06c768b2b4ea0f45da067262c8599a485a
font_01_sfnt_off0001460e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1460E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015e25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E25 10852 bytes
SHA-256: 47fe3e6db9cbc6af1b02b92130ae0b2b6460734d50588ee312342db12313419c

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