Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a5565e0180143a9…

MALICIOUS

PDF

133.2 KB Created: 2021-09-07 11:11:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0b39e3bc571e28eabb4fd20e4441714d SHA-1: 720229f7380c303d83af411b554227d431ead224 SHA-256: 1a5565e0180143a90bb6f55290757b3057d8b3afe8ca8696f7b0d483726efaba
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9878

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://catamma.ru/uplcv?utm_term=plain+talk+ken+iverson+pdf
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071cb36c2da3---lepugi.pdf
    • http://nhs1966reunion.com/clients/1/1c/1ca8f1639ee69cd7806809ed3bcda9bb/File/zenodavopobukipug.pdf
    • http://tsuiteru66.com/userfiles/file/gepujusez.pdf
    • http://webinaris.blog/ckfinder/userfiles/publics/files/jibuwisekafozixapavim.pdf
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609bfe41352dc---25837552570.pdf
    • https://collegemahan.ir/basefile/collegemahanir/files/borovukolisagotepiruge.pdf
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608432fa4ddc3---90482026979.pdf
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c850bd72085---30559869868.pdf
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/0ovgbj0njpuldk358a7a3cr96b/kagomep.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610fd4d62bfac---67892082463.pdf
    • http://anhbanglaw.com/userfiles/file/93765606353.pdf
    • http://oasis-inwaste.asia/files/file/57564949746.pdf
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4243c893d---36177231430.pdf
    • http://theclubburger.com/uploads/files/sezadebi.pdf
    • http://studiorapizza.it/userfiles/files/mekovava.pdf
    • http://kapsalonvogue.nl/files/file/9563268172.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160962ad28f72a---25538606554.pdf
    • https://ibshospitals.com/userfiles/file/49555038792.pdf
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079cf7979dff---97130430595.pdf
    • http://wurbs-hanau.de/userfiles/file/18197192398.pdf
    • http://orderkai.com/uploads/files/pevil.pdf
    • http://xn----ftbkdcamitb5h.xn--p1acf/files/fck/file/58781795616.pdf
    • http://tanabuauto.com/js/upload/files/85513400135.pdf
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/cd95d87252190bf1e30f2396dc6a4702/kamepi.pdf
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/m3enn5obsbuigjv4ug1tqd2217/60617917734.pdf
    • https://alusol-kw.com/ckfinder/userfiles/files/diletapisogiw.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_off00019ece.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x19ECE 16792 bytes
font_01_sfnt_off0001b6e0.bin
3176d54ebc4689fd49b4e432b1ebda22e37a38634ca11f74ac8bb03c807dbd5d
pdf-font-stream PDF embedded font (sfnt) at offset 0x1B6E0 20824 bytes
font_02_sfnt_off0001edd2.bin
409e2fd74cea68c847a4504a8bdd9fcd9596d14d029503f16ede7f5c68949112
pdf-font-stream PDF embedded font (sfnt) at offset 0x1EDD2 10648 bytes