Malicious PDF — malware analysis report

Static analysis result for SHA-256 f739357d8cccfcb1…

MALICIOUS

PDF

81.4 KB Created: 2021-09-16 01:30:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ee34d0c731657d7c48c4e0feab18d5f5 SHA-1: 6632626c7129240aef4f475ec00fdb560cee0bbb SHA-256: f739357d8cccfcb1f36228b08ef1f80afffc3ea10242c746b4b58ab3e2023276
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to websites hosted on compromised Content Management Systems (CMS) or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these links. The document body is unreadable, but the heuristics and URLs clearly show a pattern of directing users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://pixomot.ru/uplcv?utm_term=world+at+war+ww2+strategy+mmo+apk PDF link annotation
    • https://cebrigantina.com/025-CEB/images-editor/file/videfifewezip.pdfIn PDF document text
    • http://www.velkoobchod-man.eu/ckfinder/userfiles/files/tazadiwakolumatuweme.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/xejorosejutejopasezog.pdfIn PDF document text
    • http://allineers.netlovestories.com/upload/files/naluzivexexepawisip.pdfIn PDF document text
    • http://security-m.jp/tool/images/file/pavuxewapamokibovuz.pdfIn PDF document text
    • https://interativacorretora.com/fotosempresa/files/vovoravojemun.pdfIn PDF document text
    • http://jungam21.com/upfiles/file/1631273316.pdfIn PDF document text
    • https://greenlandpark.com/uploads/files/66537759126.pdfIn PDF document text
    • https://wildnaturetravel.com/File/49560846949.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f78daafbb4---bivujibumuzugesapujule.pdfIn PDF document text
    • https://nabil-doukali.com/userfiles/file/60535988976.pdfIn PDF document text
    • https://www.rosebankprimary.co.za/inc/ckfinder/userfiles/files/zajinorotusuv.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/161404e392d4c4---32754803788.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/ihi74kocpb7ptk3ne4his70ae2/31070542321.pdfIn PDF document text
    • http://0vote.com/ckfinder/files/tozixuzokesodipe.pdfIn PDF document text
    • http://club-integra.ru/userfiles/file/nomaga.pdfIn PDF document text
    • https://interconformity.ro/images/file/94682740910.pdfIn PDF document text
    • http://alcantara.cz/data/file/bapexoratiresagisaxusu.pdfIn PDF document text
    • https://xn--interpeas-r6a.es/upload/files/96678184554.pdfIn PDF document text
    • https://forumhrdbekasi.com/webroot/userfiles/files/runaxegizijodijad.pdfIn PDF document text
    • http://snieznik.pl/userfiles/file/78395926240.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7932af4f9---zizurat.pdfIn PDF document text
    • https://mauspro.net/upload/files/zoluwexaziv.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_off0000da4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA4B 10944 bytes
SHA-256: 1f178f4aeea510601d0e4ecafb6cbf6d81ceeba63a5c909e8d112874ea3f82d5
font_01_sfnt_off0000f3a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A6 17252 bytes
SHA-256: f91bde8de83ae788c7b837bafd64f0531838137e9e6fd25020966db0998ee226
font_02_sfnt_off00012022.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12022 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1