Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ba1d45e325daca1…

MALICIOUS

PDF

75.6 KB Created: 2021-09-13 14:54:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: a877fad6a1e3ba39ef3e2119c4792afd SHA-1: 8182a99f4ee9c3f3df799e3e2bc2ecd3378a4673 SHA-256: 8ba1d45e325daca13dd00964b8b73f0ab40e207e44509626e1fd8a2d00dd5e5c
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating it is likely a phishing or malware distribution lure. The document contains numerous embedded URLs, many pointing to compromised websites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of 'utm_term' parameters in some URLs further supports the idea of a campaign aimed at driving traffic for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://infrive.ru/uplcv?utm_term=need+for+speed+most+wanted+per+android PDF link annotation
    • https://nayyaralidada.net/alpha/ckfinder/userfiles/files/76842403337.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/cd918d6b3a4c53b56321608d2224a108/pijujixominuboniratipok.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/38540911453.pdfIn PDF document text
    • http://mlight.cz/archiv/file/kogewexasujurujukipobaw.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/96889430081.pdfIn PDF document text
    • http://olymp-kiev.com/temp/fckeditor/file/tuwinojurafi.pdfIn PDF document text
    • http://cofetariafraguta.ro/UserFiles/file/wibafizufogakab.pdfIn PDF document text
    • http://dekobonner.de/userfiles/file/riwewerobifiz.pdfIn PDF document text
    • https://childprotectionindia.com/lexcyberia/userfiles/files/nitesisukanefulim.pdfIn PDF document text
    • https://drlalashow.com/php/billboard/uploads/file/roporatojupepikud.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/2a3b486c582ad68d26c2cad8e03c668d/93430183572.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/sibepiketulevono.pdfIn PDF document text
    • http://krishikhabar.net/assets/ckfinder/core/connector/php/uploads/files/depojuvesilepawig.pdfIn PDF document text
    • http://hairtransplantmangalore.com/uploaded_files/userfiles/files/39535930333.pdfIn PDF document text
    • https://bepxuyenviet.com/upload/files/sejakimivolerik.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613567ac5276c---wuwefokazulikipunujus.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/dejafa.pdfIn PDF document text
    • https://rolcsi-bau.hu/userfiles/files/mapaxeje.pdfIn PDF document text
    • http://khyljg.com/uploadfiles/files/51315750244.pdfIn PDF document text
    • http://srtcivilnorth.com/ckeditor_file/files/50531467340.pdfIn PDF document text
    • https://marblo.marblobaths.ph/app/webroot/img/files/luresunoxogu.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/zukegosipanewut.pdfIn PDF document text
    • https://vsevolozhsk.mebel18.com/uploads/files/sivilovokoralugulinir.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_off0000c477.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC477 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC89 16728 bytes
SHA-256: 3bb013d73ca2c149c0c2a94f092236929a9b244bea79182f01fb26f7a02d73b8
font_02_sfnt_off000107ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107ED 10676 bytes
SHA-256: 75752454dd14f2e767590320dee5a940039736269057057bdec83897094d2064

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