Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b78ae297a35f57f…

MALICIOUS

PDF

134.1 KB Created: 2021-06-28 11:25:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fb3d6e19f365a1e1e648ebfe15e164c9 SHA-1: 987653598d934f69ef467652603e47c70723efdc SHA-256: 2b78ae297a35f57f11482e28b8bf312fa8919819a26793dcf9dc235581e2b290
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple distinct hosts, many of which appear to be compromised WordPress sites. The embedded URLs suggest an attempt to redirect users to potentially malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

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://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160c258ac9d73f---12487637993.pdf In PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/levabeligetokixozalemu.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/13199766005.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/53458836897.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/vizafisokadolulilob.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094ce211f24c---xedopaw.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/ziwekolawaruna.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ddc20fabf---fakopeku.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609e4cbe05999---93084056866.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cee791f3ef3---31770020390.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4ff0028e47---rigisalalirun.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/xivoxujufomepepexor.pdfIn PDF document text
    • http://adveotec.com/img/file/68542402697.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607a348bd4253---zinorobitovojaxuto.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/d8jraauol4k06rieptv1482gp5/rafonezavemuz.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/oi6oppc1v4q8emq0tu21gihm21/51088427060.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/pekijomidiladeketasan.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/a955e9a3abb9ce5006fadd4e196e8da3/nerutivefogapixebifuf.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c322d435931---74732040659.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ae909ec148a---fidudaxinomakitu.pdfIn PDF document text
    • http://canigrup.com/userfiles/file/wafawofutevilozid.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/55b2e1c04da40659976a275da90f2a91/gijerokujiz.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606c916fad816---zawalajoduxegekabalagul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=words+with+4+double+lettersPDF 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_off0001a3af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A3AF 10476 bytes
SHA-256: 370359e3a30b2609aee13348cfc5fa96c608f5ab58da2f1f09d54cdcab46fc69
font_01_sfnt_off0001bbae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BBAE 20756 bytes
SHA-256: ba13479eb84efdbfaf304bd8cd1e4305a6a3c2a37becf9d2bfad203e14bc391f
font_02_sfnt_off0001f2ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F2BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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