Malicious PDF — malware analysis report

Static analysis result for SHA-256 87dba234ba7da38c…

MALICIOUS

PDF

78.5 KB Created: 2021-08-05 21:43:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 519b2f8cf22fe2e49071883efe562add SHA-1: 1969dc845f59dfc61c39a9b623690d32905eae87 SHA-256: 87dba234ba7da38c2dfa1112414a885708d2560f2bbf855119b0668509b5c4a3
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable domains. The primary purpose appears to be directing users to potentially malicious content or phishing sites, leveraging a technique often seen in spearphishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://cructi.ru/uplcv?utm_term=exercice+anglais+6%C3%A8me+have+got+pdf PDF link annotation
    • http://ebsenglish.net/_UploadFile/Images/file/lapojilirojegabevajar.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160d9052c58a6e---93948892449.pdfIn PDF document text
    • http://africa-emergence2019.com/userfiles/file/11724322839.pdfIn PDF document text
    • http://alkanboya.com/files/file///51020755129.pdfIn PDF document text
    • https://melz-feu.ru/upload/forajujig.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/zifuve.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/48pkihlkashvnsbsfrkb6rtnvt/wurobiretiniluwaxojex.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/be99715033083c1916fb2787fd178d05/garavutokovimolemimo.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/v580u4rcvii51820tkhhceluv4/bulakatajibesubisuseloseg.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/70425152299.pdfIn PDF document text
    • http://csc025.com/userfiles/file/20210614014451_j4lg7p.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/b5bq9tt761qtblqmhunfmdv2u3/pemanijadeto.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609eed4c60b99---ludavoji.pdfIn PDF document text
    • http://mamitobe.ru/files/file/49404104139.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c137721b2e6---94780595448.pdfIn PDF document text
    • http://mtcongnghiepxanh.com/upload/fckimagesfile/59798419631.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608550f205416---38880406816.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/4776773976.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a46d381fcee---jivikibonalupumor.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/o05mqnpmgv8gf1dlvvva7fnkrs/xapujidibovegi.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3dba4c25d---37863344430.pdfIn PDF document text
    • http://www.mostex.sk/files/articles/file/31447298798.pdfIn PDF document text
    • https://getracemirates.com/userfiles/files/62584672668.pdfIn PDF document text
    • http://accomplishtheimpossible.com/userfiles_ati/file/kovinuzulol.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_off0000c9a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e1be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1BE 11540 bytes
SHA-256: f1f9df242419764996c59e552a02204a9add14942f0158daba614ba8227df376
font_02_sfnt_off0000fc78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC78 18160 bytes
SHA-256: 61637a97cb3d8d7a51981e40fad8c43974e0d22a68e54ca0bd267ceaf75f0c96

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