Malicious PDF — malware analysis report

Static analysis result for SHA-256 e55b66d17e18b140…

MALICIOUS

PDF

90.8 KB Created: 2021-09-01 22:21:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4ae9ab9553f88480158f85aea302e4f5 SHA-1: 61d15d87889705fc692e5fcc87385ebe235a5962 SHA-256: e55b66d17e18b140a2e5d6c1b7007ede8b5e7b854fce9d066f297389ff88dd1d
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, likely intended to redirect users to malicious sites. The document body was unreadable, but the heuristic firings strongly indicate a phishing or SEO manipulation scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://gancza.pl/userfiles/file/besokuzewesasaw.pdf In PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/78f5d35b3dc0e67ee7d1270bb808c4a7/85476764138.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/198a4faa2f021aa9cb614aff98abe127/29724996313.pdfIn PDF document text
    • http://sushigonewildtogo.com/uploads/files/40607039620.pdfIn PDF document text
    • http://xn--aknmedcal-wpbe.com/uploads/file/bobebamorisobasemud.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074fd14c09e9---68201504121.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160ecaa9422074---8522213351.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/1f61ea1cecbe824165cd182af02e8bb4/junifamuvigigiwelam.pdfIn PDF document text
    • https://istanajp2.com/contents//files/zoxoxepafix.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/2a005aaa275197e3aad7650ce4816d8c/68690749771.pdfIn PDF document text
    • http://rulada.by/upload/editor/files/tukikurezozax.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dddcad90b7---basuwasuzemebapukewosili.pdfIn PDF document text
    • https://gs-hemeringen.de/ablage/userfiles/files/padazuzov.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160849bdb6f4ea---97830341281.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/vodibudodamifojos.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/uho3q83dtkg8lke3s1hhp16hvp/78709096041.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/88376646680.pdfIn PDF document text
    • http://smartraoptics.com/fck_filemanager_upload/file/zubegaxofadarobexa.pdfIn PDF document text
    • http://branpc.in/ckfinder/userfiles/files/risuwukazilarowewir.pdfIn PDF document text
    • http://ilovehikari.com/uploads/files/wabiromebibeguralifeloros.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/15523812563.pdfIn PDF document text
    • http://poongdung.com/FileData/ckfinder/files/20210806_055FA639C1BF7E12.pdfIn PDF document text
    • https://worldmedglobal.com/userfiles/files/razokebofaxunowojosumijed.pdfIn PDF document text
    • http://starlightcelebre.com/clients/4/43/43e9139217482d7666ce300faf566241/File/47083251165.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=what+do+u+feed+snakesPDF link annotation
    • 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_off0000fe04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE04 18044 bytes
SHA-256: 6d13e378a659a5e628e5246eaf20440d6eec8b32ecc9a8488b85f13f2a68d18a
font_01_sfnt_off00012d29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014540.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14540 10400 bytes
SHA-256: adde073c1f25e55379d68e04c3724f3b4a7b72c4baf379c82ef0ef2035046129

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