Malicious PDF — malware analysis report

Static analysis result for SHA-256 65fc0b91473d5d2b…

MALICIOUS

PDF

84.6 KB Created: 2021-06-27 07:52:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b6d44f984a8831acb2d3ff121db5c20b SHA-1: 271df916d77e22b441f4bb910dc7c42263a75353 SHA-256: 65fc0b91473d5d2bf8d9201ae33b42fca33baa0a6c341440b88bce5e13153cab
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous URLs, many of which point to compromised WordPress sites or are structured as link farms, suggesting an intent to redirect users to malicious content. The presence of multiple external URIs and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://medvor.ru/uplcv?utm_term=italy+guide+pdf
    • http://tsg-edinstvo.ru/userfiles/file/95246787462.pdf
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/73a45d1349ee1ff964db6bd82819d49b/78784146547.pdf
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16099d74f968ec---68130056430.pdf
    • https://secolink.sk/userfiles/file/60719142995.pdf
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/41avm2cc8p0t7mnr1uk7r2dsro/tuximox.pdf
    • https://anmoul.com/userfiles/file/gogalebot.pdf
    • https://youkuvpn.com/upload/files/gonepodawavinufa.pdf
    • http://metamorfoza-krosno.pl/userfiles/file/subadoxuxuxameru.pdf
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa667c4ac8---tuwosi.pdf
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b48bbc63f4e---78744164542.pdf
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/4nlujn9hvrtv7l8stqrmfvkee1/narojiwigevemukaji.pdf
    • http://budohurtsa.pl/userfiles/file/kisekuzulujeloneje.pdf
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/c2b2460209643b56abac9a2243336dca/22368219353.pdf
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16087bd20193f8---manaxeroxugigovugoxabula.pdf
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608492d828467---jopugenokadurivi.pdf
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/gqqsu0h79gfl5n0ji7mrm1ce00/37992644621.pdf
    • https://ludifrance.fr/userfiles/file/33015174873.pdf
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1606d683080755---39399535251.pdf
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/c99d3eadbf8581fcf6b9894961c2a501/77368786324.pdf
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d00cc6bbf4d---dogajipezom.pdf
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/dd086cda2fb83486672a9a87ee0f1a1f/46450496816.pdf
    • http://anhuishangbiao.com/upload_fck/file/2021-6-8/20210608135034516831.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_off0000e8f2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F2 16792 bytes
font_01_sfnt_off00010104.bin
98163bcc151bf1c6501e07a3dbb6c2c417256ae0d63ae5c84aea72ef169a81f2
pdf-font-stream PDF embedded font (sfnt) at offset 0x10104 17280 bytes
font_02_sfnt_off00012e0a.bin
ed74d15093b991a2ff93f93d8c836d15779731d7da8620478726a408190a6321
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E0A 10348 bytes