Malicious PDF — malware analysis report

Static analysis result for SHA-256 931efec167004904…

MALICIOUS

PDF

92.2 KB Created: 2021-06-26 12:51:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3b9645047ceb28a3bef592a6fcf2dbd2 SHA-1: 8e4a5746327ff385118f6327f55f09ec2e4cbddd SHA-256: 931efec167004904ebabdfa41055821c758c4decd5d186756fc9c7e92fca5241
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It contains a link farm pointing to numerous URLs, many hosted on compromised WordPress sites, suggesting an attempt to direct users to malicious content. The presence of external URIs and link farm indicators strongly points towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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 https://ketchas.ru/uplcv?utm_term=the+handmaid%27s+tale+synopsis+english
    • http://vote4dannybarry.com/clients/2/2f/2f5d4f67c16906f9b09010289963de11/File/zawugikewusev.pdf
    • http://hcvitamin.com/webroot/img/files/27443077738.pdf
    • https://apskarota.org/userfiles/file/ruguzaxemivedi.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b0355fc26e5---sozevojopemerukajigutaz.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bfcb3d5c11b---naxalinarup.pdf
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/16090bf05032df---mutaxenafifotogi.pdf
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160750c748984e---jizuzijeregisuruku.pdf
    • http://humanitool.ru/userfiles/file/66004900893.pdf
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d506bbc5cea---wedeve.pdf
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6fd2253a3a---subopuwojakagowewewo.pdf
    • http://akkoryazilim.com/userfiles/file/88513490092.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba79eb30996---6998380523.pdf
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160acbbf434562---15506421058.pdf
    • http://fontanarosaserigrafia.it/userfiles/file/bunerekosid.pdf
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/e37f9035b92ed444ac4ff0ec13769587/56102405326.pdf
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e82c535c8b---vilavotusetow.pdf
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cde70648c5a---53408070149.pdf
    • https://geneticapanama.com/userfiles/file/92737843893.pdf
    • http://dianacb.cz/userfiles/file/45817201565.pdf
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b77b316090f---juretaporuzute.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/a8jk70a40cv16jbv50u1tnv4gi/98703520599.pdf
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/da3f46d6dda1bb5989af19fd6185beda/49528319329.pdf
    • https://zegabilisim.com/calisma2/files/uploads/57648143529.pdf
    • http://kovacsoltvaskerites.hu/images/file/josepitijeraragabege.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000106eb.bin
7869352386fa4ee16c0037b2b1c603fbc21b30d55bc0c69788f64bc3bd9e0969
pdf-font-stream PDF embedded font (sfnt) at offset 0x106EB 10852 bytes
font_01_sfnt_off00011f9a.bin
a852102315a6e1c868894a836d207255168a8c953764204587086af892087675
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F9A 16812 bytes
font_02_sfnt_off00014b2e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14B2E 16792 bytes