Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba16ee15a4df422a…

MALICIOUS

PDF

95.8 KB Created: 2021-06-25 18:05:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 25501fcbf9e413eae551aa6aa44ec5c0 SHA-1: 1d7407c24cf532a3855e6b7daf9f89248e66b85e SHA-256: ba16ee15a4df422adb76d5414a2faf44d88ebe3f5e66bc333b571dd53cd0a109
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which host other PDF files, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely used in phishing campaigns. No scripts were extracted, but the structure points to a multi-stage attack where this PDF serves as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/ca7442f558280bf62fbe909bf1f7c876/99817151312.pdf
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075abc8f1d78---93556643912.pdf
    • http://caigeshi.com/uploadfile/file/2021052914355573499.pdf
    • https://himalmanpower.com/ckfinder/userfiles/files/zavajaporilefujufu.pdf
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/314c1f2a117300ecb6571105d79db55a/gemuxetipuvo.pdf
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb3e0a3158---lidevululikoradikusanuto.pdf
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/k100fmbvhshi0f8ul6ossnf1o6/54155820546.pdf
    • https://medicentrumnz.eu/medicentrum/files/file/59700741302.pdf
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c36be0ad313---kofobikasamatajuzifa.pdf
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/2fs64t1dbevccinalglh7ur6h3/28861952559.pdf
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/ccb68d84affbcc0677b6628e05acbf3a/91515883402.pdf
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3ea783c66---79011161316.pdf
    • https://argumentua.com/i/file/56164899558.pdf
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/orrte1eqqkomft6iodig9420l0/47178036022.pdf
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3be764c32---jopavomapukakedodukig.pdf
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160918c97918f2---60537803496.pdf
    • http://angelojrobles.com/admin_initial_test/userfiles/file/nowanoxixeguniniwiv.pdf
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090fbe6b363d---tebarumo.pdf
    • http://sosnovgeo.ru/userfiles/file/zotefewekaruzukib.pdf
    • http://aaaexpressheating.com/userfiles/file/1113132729.pdf
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070dd5c32b45---votixujiredomorenidugaz.pdf
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/qjnfn0dmgkfun99jqbd7rcksa1/80220205179.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=write+the+fraction+in+lowest+terms
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/396b6bf972c68a1a4b7861ce8879543e/52349096542.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f72d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF72D 16792 bytes
font_01_sfnt_off00010f3f.bin
54e78a424796dace4958d3ccb5a7027d18b022cfad3f114434b3b34c13549fd3
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F3F 19356 bytes
font_02_sfnt_off000141ea.bin
0cc2cd2dff54d6ab36d69b928f7d55095fa38ebe4ec058da5a9fbbae8b538350
pdf-font-stream PDF embedded font (sfnt) at offset 0x141EA 10680 bytes
font_03_sfnt_off00015a45.bin
c2c90cbae49882538387aeb76e1c5695d0283d704d6d3180b89ced8737a56801
pdf-font-stream PDF embedded font (sfnt) at offset 0x15A45 17328 bytes