Malicious PDF — malware analysis report

Static analysis result for SHA-256 5186cf2b7a536330…

MALICIOUS

PDF

83.3 KB Created: 2021-08-18 01:56:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 88b53e610bdf35cd326681e3fda85a09 SHA-1: 8d3b3acf7aca8f39f315a0da867a97ebb0b17db0 SHA-256: 5186cf2b7a53633076e528e5e0f7ac385ad9a7bdf37167cd1c641010cab25de3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised CMS uploads and disposable domains, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://allytemp.ru/uplcv?utm_term=rocky+1981+movie+mp3+songs+free+download+320kbps PDF link annotation
    • http://asiavent.com/UserFiles/file///12689498659.pdfIn PDF document text
    • https://candbco.com/ckfinder/userfiles/files/53181231635.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ffdaca8260a9a6585ea2b96f2f6eea27/68590262005.pdfIn PDF document text
    • https://amblamy.ee/upload/file/54932973920.pdfIn PDF document text
    • http://bethtikvahevents.ca/clients/2/20/20a91c0cb94b02964b0d1c5d980f1596/File/wunonotuvolibaneta.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/15916734049.pdfIn PDF document text
    • http://www.parinet.fi/tiedostot/files/82917945894.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c4118a3356---65909754175.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077fd006ca81---dejirunuvowinudopixo.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/f18a547f8d723538afb518cd78f5fcc1/40807902538.pdfIn PDF document text
    • https://dorfadvertising.com/ckfinder/userfiles/files/telosisivif.pdfIn PDF document text
    • https://panificioilcavaliere.it/userfiles/files/mivafigarezakavexiwegidu.pdfIn PDF document text
    • http://cl-metalparts.com/d/files/ganagokuwifamogakojimu.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e28e2a91733---39349682101.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b5fab388c---rivesupabajalasupezatu.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160abb3f08677e---sibajedow.pdfIn PDF document text
    • http://zimmerei-possert.at/tuwipataki.pdfIn PDF document text
    • http://nsk-nalogov.net/upload/files/darisepaduzuwig.pdfIn PDF document text
    • http://nyett.hk/uploads/news/files/fowakasegitowefoxowu.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/42351754061.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/jibegojoxotaf.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb9cf18ad59---dizuwajo.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160f5617eb6dea---vulazodunujijo.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_off0000dde9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f600.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF600 12252 bytes
SHA-256: 33a245bd37c1c30ca9af2a502759d3942620d37f36d73dab15b160821f698065
font_02_sfnt_off00011376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11376 16840 bytes
SHA-256: d65afcae234d625c9b24abb076ab57b81b875fef78ac87afd06ca9bd4a078315

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