Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9e71814dacd4578…

MALICIOUS

PDF

83.0 KB Created: 2021-07-31 19:38:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 95e4eadd356f26112bbe62ef3a40f729 SHA-1: c221a4eb947f3ff00ae2578adace2f9e5d89d99e SHA-256: f9e71814dacd457853f97794e0c7f74b56556631ed63c0ca3badc0246f3230b4
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 contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of multiple external URIs and link farm heuristics strongly indicates a phishing or SEO-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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 http://www.chatanakonci.cz/userfiles/file/xavovog.pdf
    • http://studioscoponi.eu/userfiles/files/88836070385.pdf
    • https://havanic.com/cache/fck_files/file/tufap.pdf
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e9d642c1af---95689096989.pdf
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/lqg547j0knhht10muq5muvupn8/wetarufuwep.pdf
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/480210e8fa96001508d7c8433725cc57/pexab.pdf
    • https://congtydaihai.com/upload/files/ruvani.pdf
    • http://startent.ru/SITE/files/editor/file/30336115353.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607858a189141---webubozotita.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/jb0d8jkoufinok0dqgj7r43ap7/43837974823.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/58fbece09b82ee7696a60dc9954e5885/xizavevot.pdf
    • http://africa-emergence2019.com/userfiles/file/74211527545.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/mk8pe25sj2c69pae3fuddgq0r5/62278307245.pdf
    • http://fence-alarm.com/userfiles/files/15510435364.pdf
    • http://eluvial.com/sites/all/sites/eluvial.com/files/zapeketebupilukazijewux.pdf
    • http://capital96.com/userfiles/file/48241233937.pdf
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/pjrcqcrjcoe7gvd2v4ijcf1te0/92470857945.pdf
    • https://marathonroller.com/userfiles/files/katoxuxisagukafuzemotar.pdf
    • http://susasoft.com/upload/userfiles/files/jetilojagesezo.pdf
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/a9pjor74nbbf4b0jqapktr96ma/bupekosusemiwubuxu.pdf
    • http://sclifeguards.com/clients/16854/File/fopojevon.pdf
    • http://kapelski.pl/userfiles/file/xunoboliranedavax.pdf
    • http://vankouwenenmastop.nl/UserFiles/file/2769657859.pdf
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/b713b113daf4dab2c0eb07eb8736702b/tugejosurutu.pdf
    • http://email-database.info/userfiles/file/zokanesuvefedirezemafezi.pdf
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/f654ab3ae7287227bd995c8737eab24a/sikabufuvuguxevepazesi.pdf
    • http://maristaslardero.es/userfiles/file/62842027774.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/08889b3c5676984155749845f800000c/40048917222.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=killer+whale+orca+simulator+3d+free+download
    • 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_off0000e00c.bin
eb579a80ed68cd4ee8053aaad4f75b262c6a038720891a996803aebfefc29b6d
pdf-font-stream PDF embedded font (sfnt) at offset 0xE00C 16492 bytes
font_01_sfnt_off00010aed.bin
704e653349c221d1eabe3617784c854e2f35a7e5133aa5d1bc5c9091f4463d3d
pdf-font-stream PDF embedded font (sfnt) at offset 0x10AED 11092 bytes
font_02_sfnt_off000124b0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x124B0 16792 bytes