Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec42867e31b728b6…

MALICIOUS

PDF

80.3 KB Created: 2021-09-01 05:01:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 15f45aca4de371803adab6f09aef748e SHA-1: e3d37321e1ac64490a069239c028e2aa8cacdd01 SHA-256: ec42867e31b728b618de2fc1e6f23aec58029a4f9a036371a56509e4af1de0fc
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to multiple external URLs, some of which are hosted on compromised WordPress sites or disposable domains, potentially leading to further malware downloads or phishing attempts. The presence of 'cmdvt8997v68cfgfu2e6igg/donilelamawavavoli.pdf' in the document text suggests an attempt to disguise or obfuscate malicious commands or URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://huntic.ru/uplcv?utm_term=bloodborne+ng%2B+differences PDF link annotation
    • http://heyibnb.com/CKEdit/upload/files/kemozuvepovogazev.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/gulodewerax.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a79897ee768---87793253429.pdfIn PDF document text
    • http://cuspsurgeons.com/userfiles/file/17786070508.pdfIn PDF document text
    • http://arsvet.ru/img/upload/40201136396.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/4099524b17a1d9cf1f7851b07cd0dacb/refomevelexonodanelorumat.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/7a9b250f99943cf5ecaf96a7e5c2d356/namazegejizaw.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/9m5c8mmjfbcvid6hrb2dofcn65/30997146069.pdfIn PDF document text
    • https://thietkewebseo.com/webroot/img/files/16701594412.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/a36bd2d86a5025db9d637b478fbf0f9d/rulapogivoviji.pdfIn PDF document text
    • http://xn--80aafbanafwvcftiqfecrg2a.xn--p1ai/pict/file/95712933116.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/dq9cmdvt8997v68cfgfu2e6igg/donilelamawavavoli.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/kokewazazujiwigob.pdfIn PDF document text
    • http://architettomontanino.eu/userfiles/files/73071054786.pdfIn macro / runtime command snippet
    • http://clinicaveterinariaalbese.eu/userfiles/files/rekojusozugivir.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f58e4185d---nitobineragit.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/23309983424.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160ce1f0f52cab---palebuxajolexuze.pdfIn PDF document text
    • http://timnhanhonline.net/upload/files/pegekuzeza.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/e4d267ca6acdf6138485341fa82bd887/kapukefotupixuzagenegaji.pdfIn PDF document text
    • https://cakamuzejs.riga.lv/ckfinder/userfiles/files/6841758136.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_off0000d3e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E3 18616 bytes
SHA-256: 1e183c08e3175f74051e6d63913adce59b4c7b6b2138d36d4f18acf4f2bcd351
font_01_sfnt_off000102a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011abe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ABE 10584 bytes
SHA-256: 376cde2b8c53c0926a0b79deca96cc7a711b77a80059686eabe4ee614243e3cc

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