Malicious PDF — malware analysis report

Static analysis result for SHA-256 655d9fb58dbaed60…

MALICIOUS

PDF

82.5 KB Created: 2021-09-16 01:48:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8f62acb2846ef02c95719b8536948680 SHA-1: ff5c53d5bacd46c4aae23184d850a8ddc3ee8155 SHA-256: 655d9fb58dbaed60ed0ee20199b4eee6fe8de3da59aca6f049b59605e99d2256
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the URL structure and heuristic firings are sufficient to infer the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://archism.ru/uplcv?utm_term=how+to+reboot+android+without+power+button PDF link annotation
    • http://rajasthanmetals.com/userfiles/file/13871233973.pdfIn PDF document text
    • http://sloplast.com/userfiles/files/72548259956.pdfIn PDF document text
    • https://ewdel.cz/ckfinder/userfiles/files/81508970593.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/64a2359dc5a4ae906e35796dd6edeff3/13341788278.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/39831745048.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/ac67710f6eda5d2f1b1a84f7f4b8e8c8/wozoluwibuxujarugalami.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/xilopepujujaxevafukevus.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/43ca2d93803902a236d8ce334f9924af/ponalunogubavitugada.pdfIn PDF document text
    • https://ssvacancy.com/ckfinder/userfiles/files/58061478754.pdfIn PDF document text
    • https://stka.gr/ckfinder/userfiles/files/44975155290.pdfIn PDF document text
    • http://artio.pl/files/files/14806259622.pdfIn PDF document text
    • http://teormech.ru/teormech/usrimg/file/35989348904.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/99978348714.pdfIn PDF document text
    • http://wedooverseas.com/userfiles/file/vulidodozikoroguwujifojef.pdfIn PDF document text
    • http://metabolitplus.ru/files/file/37206276648.pdfIn PDF document text
    • http://manu-transport.com/documents/file/80748129050.pdfIn PDF document text
    • http://abbwingslynnhaven.com/uploads/files/97573672519.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/55c2e32488c2d998f8418c54d1f02056/renazenugepomat.pdfIn PDF document text
    • https://orrizon.ru/images/file/ruzomukokupawiru.pdfIn PDF document text
    • https://typeone.com.my/ckfinder/userfiles/files/rokalizididivuleturid.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161426607246b7---fekof.pdfIn PDF document text
    • http://355353.ru/userfiles/file/jufivabowobixavaxas.pdfIn PDF document text
    • http://ski-experience-japan.com/images/blog/file/zemekasatije.pdfIn PDF document text
    • http://mustang.tom.ru/jsplugins/ckfinder/userfiles/files/lewixiwuda.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_off0000dd52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD52 18616 bytes
SHA-256: 2636d11a800bb8c4b6ac15099440c16753e339871b741c1625c4647d01b00bbb
font_01_sfnt_off00010c56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001246d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1246D 10592 bytes
SHA-256: 527cfef5ee8fec48a00bd7ebfd240878e27d50578b2559332bd4f0da99bb8a92

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