Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b6c7bfa76364b29…

MALICIOUS

PDF

168.1 KB Created: 2021-07-15 10:27:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 239be08fe920bd8a7656fdd255ba7c78 SHA-1: 4327351251a6142eeeeb2dcae14e8c2835ee72bb SHA-256: 0b6c7bfa76364b2930507f4c0a0273ac171752dc6f688bb3e0ed5498cad0469d
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution attempt. The ClamAV detection as 'Pdf.Phishing.Trojan' and the ML classifier's high score further support its malicious nature. While no scripts were explicitly extracted, the structure and URL patterns are indicative of a malicious link farm designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9641

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://coretry.ru/uplcv?utm_term=plural+of+5 PDF link annotation
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/6h24nsdkdlfmm47gsjags0rfuk/97138032129.pdfIn PDF document text
    • http://iwilldoit.ru/uploads/files/files/362297921.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/16815828869.pdfIn PDF document text
    • http://matonaklawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zigolajuzagavatusume.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/dumosifuzufuromom.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/f9840f8b58a22eaabfcc241238a5184a/jufigilozaxebamanop.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/431c1700198203292da7e42217374a90/2789362295.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077545371997---xamagotobifego.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/be387a785587f349be5c696977f3af81/807582173.pdfIn PDF document text
    • http://adveotec.com/img/file/71642022493.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e54f061f74---gezuvixisope.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160884f2b0ea04---dutosinilum.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/2954539668.pdfIn PDF document text
    • http://ridendo.cz/files/file/30627367166.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/jowolojoxutagotiripu.pdfIn PDF document text
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/60971930927.pdfIn PDF document text
    • https://faktxeber.ru/resimler/files/25208900505.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001f3e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F3E0 22540 bytes
SHA-256: 445b28c0852ab3ec89da6d9b7cc4d63a9073d330315142fe20ec24c6317599b3
font_01_sfnt_off00021c44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21C44 26160 bytes
SHA-256: 717807ef119d117cce8b938a11edc74d561a291fc9d01855d4b3dbdd97df4d99
font_02_sfnt_off00025cd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25CD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000274e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x274E6 9848 bytes
SHA-256: cd32fc75ec63fb908c7899960fd8b6ee421a84bd078df47fdd419cfd7989af5b
font_04_sfnt_off00028ab3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x28AB3 1704 bytes
SHA-256: e4f035f98972946864e5ec6b782be1ab20aab397120685f0370b3fba311b69c8

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