Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b7e574a941319a5…

MALICIOUS

PDF

106.4 KB Created: 2021-07-04 09:13:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 4018f6774f2bc3c42c3e04f8f682c8fa SHA-1: ef0297f8db5148f5e69b16161d898ed191da64c4 SHA-256: 7b7e574a941319a5d1b945e3d33e77bc41e5d3b022da4f84ab154ae27f5f8d0e
156 Risk Score

Malware Insights

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

The file is a PDF that contains a large number of external links, many of which point to compromised WordPress sites and disposable domains. This behavior is indicative of a link farm, often used for SEO manipulation or to host phishing lures. The ClamAV detection and ML classifier further support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9687

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://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/e65458bb1dec874f02db1fbb470d4c66/vonimi.pdf In PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/b1mp2jfp3cmubvlu2qv9j51u3b/2102939597.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/43e9d02025c63d6db588d8a79fb82c0a/napuramabulujufuvuzu.pdfIn PDF document text
    • https://dodatkireklamowe.pl/web/uploads/files/mabixinilezodaval.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/8855316152.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/05971b4202841a6b4cdac855f12e93bb/ragupigozip.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/3f93a6b60549d1cf95399fda449c6566/pimugusasukuratulixalow.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c10d6a98f---logabigitiboxibopokinitid.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/a2d9251a902602e523126eb0f74ad609/bafogujakamumi.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079546465427---jodezorudasaworikevifezo.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/f4b8a8c7e5c21234b12d633c4eddfe16/32211115357.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/bace35d54612aa6855292c54c377bf43/vopasorebeziwerorisiva.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/a9af666cb525e44d78646ba11791ed73/nebevopugagomixu.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/1b7521aa29e6f93339aed650738c107c/85324113161.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/b17539be960d7a269bee76f48697b2ac/39163105288.pdfIn PDF document text
    • https://principesgs.com/userfiles/file/29463982664.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1a88ec57d---godajimegonajanefixowozo.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2027fa5d11---14241657173.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/f849fr2s4vvv5jbg6ia918idp9/xevafapokota.pdfIn PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/23554573038.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/407d476a6dea123ebda84dccc183dcde/tezejepajiwaxup.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160716dc20d82e---gobirojewubez.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a047b25573c---zolopabezipevorozepisawu.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/1878391a422e172991b21c829461046a/wepir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=nioh+2+master+of+the+dual+bladesPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011b2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13345 10852 bytes
SHA-256: 5d9804152613eff9661bb316e099091d260f1ee9d6ca8a3da12404b0b79c87fd
font_02_sfnt_off00014c61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C61 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
font_03_sfnt_off000161a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161A2 18988 bytes
SHA-256: a5146e711af127161143c2ed3dcfb2f35aa39e7386f230247fd47952f6770296
font_04_sfnt_off0001926e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1926E 1860 bytes
SHA-256: f66b0d208d3dbe02eb8a71cfaea3c76857a7791825096525dadcba68f1f46a51

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