Malicious PDF — malware analysis report

Static analysis result for SHA-256 a03f8f7135f693f5…

MALICIOUS

PDF

119.7 KB Created: 2021-06-28 04:19:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8a2255939f5a331493a7ef7893db4b58 SHA-1: 1fa28e5a2ea8b54f67ffe98c010380b46a3d15b6 SHA-256: a03f8f7135f693f57f42f67f92492f5ae3fcc5b0bc6189d15d6ccc88082e8fdb
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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://dj-venci.com/uploads/pages/files/belas.pdf
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d70cad1b99---zulavawowilafesijowufod.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed0c848258---43957069924.pdf
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/71861208123.pdf
    • http://momsystem.ru/public/file/zogavejavazubinif.pdf
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcc3dfc25fe---fibojigel.pdf
    • http://peak-experience-japan.com/xapowixo.pdf
    • http://martom24.pl/martom/userfiles/file/99480272295.pdf
    • http://evergladesharvesting.com/ckfinder/userfiles/files/64720414690.pdf
    • https://tailormade-sales-marketing.com/userfiles/file/94360278164.pdf
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/444b371d20d2100470ba329f7994b0ee/49359291658.pdf
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/f6725553e07131c50b0711f30a00979c/ximadav.pdf
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088749deaaa5---rowunubiniwezov.pdf
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f8a9e8208cc9aebc066f475ac41111b2/nururakifomimiwositop.pdf
    • http://valleypainclinic.org/userfiles/file/mebajatapudo.pdf
    • https://aarhuskortet.dk/images/file/71372714768.pdf
    • http://linkipt.com/_UploadEditor/files/litujesarupuz.pdf
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/chbs5d7ulpvuei3qhmdv2v80n7/73364360542.pdf
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607377054023f---kodijogigukuxeme.pdf
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160773587576ff---77790087565.pdf
    • https://qnzar.com/files/jilapizejilaroliriwiwobud.pdf
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081957bccb78---liwigowunuzezefosiloze.pdf
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/ddb9532b752c02f812da0ecb1f5cf508/sufekulexitovulowazubekuk.pdf
    • https://haysalon.com/public_html/userfiles/file/40631912971.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/m2v276g97pig1j17919qj98q17/83195729268.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=geography+of+ethiopia+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_off000170c7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x170C7 16792 bytes
font_01_sfnt_off000188d9.bin
b4d6e146e1eb8b101486001440f9285f2f7ef99ca817a18becd528f5e7878759
pdf-font-stream PDF embedded font (sfnt) at offset 0x188D9 17736 bytes
font_02_sfnt_off0001b783.bin
4ae2e055a8f3a6b93babeebfd0fba36373fe3692429348bba8dd7074f0e01cef
pdf-font-stream PDF embedded font (sfnt) at offset 0x1B783 10612 bytes