Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd664852f5fe4f35…

MALICIOUS

PDF

80.1 KB Created: 2021-09-22 23:03:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a92a40762a5c4df3cb92178916dd8b78 SHA-1: 9b2a930306ea9c6d292f61e0804a1d112d02706b SHA-256: dd664852f5fe4f35e99daa6e445056e0c966b1da56901cffd05ab0448ae26b7e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm designed to obscure the ultimate destination. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a strong attempt to redirect users to potentially harmful content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://synerhu.ru/uplcv?utm_term=best+rom+for+mi+a2+lite PDF link annotation
    • http://kursadowicz.pl/Upload/file/vavokugip.pdfIn PDF document text
    • https://hijaustabilo.com/contents/files/joxawoxejo.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/65618916125.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/2c215b452324677a9c4b74ba61889fb2/1260221134.pdfIn PDF document text
    • http://wedding-box100.com/uploads/files/202109031713124325.pdfIn PDF document text
    • http://ambulatorioveterinarioilghirlandaio.it/userfiles/files/69143185783.pdfIn PDF document text
    • http://inbjnews.com/data/cheditor/0603/files/momiwufo.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614521acdd195---tixanatepumepugimuw.pdfIn PDF document text
    • http://2018.letnifestiwal.pl/ckfinder/userfiles/files/pukefafowumomokujejexi.pdfIn PDF document text
    • https://plewmal-d.com/Uploads/files/wepafoponiwi.pdfIn PDF document text
    • http://traiteurluc.com/userfiles/file/gefojofamamelo.pdfIn PDF document text
    • http://nowator-zpu.pl/userfiles/file/vawizugewidasevoratak.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba7819e250---47857469542.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/98668309434.pdfIn PDF document text
    • https://vhssirimpanam.org/ckfinder/userfiles/files/35725156611.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1614969a3a8bd5---tuvumijimutovojerokixab.pdfIn PDF document text
    • http://scro.ru/pic/file/xuxejojefitasijopodaveda.pdfIn PDF document text
    • https://arerp.kr/data/file///44581565289.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/bojakibuvijatuk.pdfIn PDF document text
    • http://msmzizkov.cz/data/dokumenty/kugevotozafotimabevomow.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/redam.pdfIn PDF document text
    • http://smartpaintingplus.com/userfiles/files/samokegabebefumuwom.pdfIn PDF document text
    • http://ducthanggroup.com/webroot/img/files/wofafoxud.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_off0000d553.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD553 10444 bytes
SHA-256: dee76d608f45deac173eb77098bcaaa161dd42d4934ba769c43f2fbb6a78dc02
font_01_sfnt_off0000ed26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED26 17392 bytes
SHA-256: 3f4a8d550264dc7369629039b4402fc0c1c8a1d395a6d5c4c55599cc1ad10333
font_02_sfnt_off00011a79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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