Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bdea5667f6a6c17…

MALICIOUS

PDF

85.5 KB Created: 2021-07-06 16:26:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fc0f9612213aea2e75cb930463473027 SHA-1: 005437cb42f2b8ef9e38b465732c4b401b93d6cd SHA-256: 7bdea5667f6a6c1749607bd7ea1b26ee3d7531859d9da3c1ed72b9889fcd9df3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm, with numerous URLs pointing to compromised WordPress sites. These links are likely intended to lure users to malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

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 http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160b0b52bb014f---83999159536.pdf
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609df7e7d5bf2---49282532853.pdf
    • https://flexrocksrollovers.com/wp-content/plugins/super-forms/uploads/php/files/lk26gl9l2as46qecveiics3b13/27478972498.pdf
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/bdb1839d817ad291b7b465c8ffddcb50/silejakapuw.pdf
    • https://www.reflectionuk.com/wp-content/plugins/super-forms/uploads/php/files/1d0sdk0ikd3l2buia3dj7jrcdu/xewubiborepi.pdf
    • http://stlnsk.ru/uploads/file/43557790317.pdf
    • https://tl-systems.hu/files/files/1386201804.pdf
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/aa5lerod0en6fneh5rtn52vbt1/12837266435.pdf
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/affcc241592b6fd99786e53619c0d52d/luwugefevepenitizos.pdf
    • http://sdds.be/userfiles/file/tojuzudusudexatam.pdf
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607743c511abe---69534926859.pdf
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/oh4jba4v1a5gi4c9gh29ur8jfk/lomojatavo.pdf
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b773188f295---bagexibozu.pdf
    • http://artecgroupservices.com/imagenes/file/xalojuwanatexazabagu.pdf
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5293760be3---jiwunudunir.pdf
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/bcfebb19caf055b874c1a4f6e7dc6fdf/62793212786.pdf
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/n8finn2bm5mvmf62vbc4hdo82d/debakesafudefixebigadujom.pdf
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160886ab1b864c---25308833391.pdf
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/vaa28gj66oj8mh8ka64ic4i0s6/xisalorajevuzu.pdf
    • http://quickvideo.nl/userfiles/file/wizenazewomedu.pdf
    • https://craftsmancuttingdies.com/wp-content/plugins/super-forms/uploads/php/files/24865cd5f718602cd022e9f5b7b71fd2/78339627828.pdf
    • http://studiotecnicodavico.eu/userfiles/files/lezum.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=boy+names+with+g+letter
    • 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_off0000ea5f.bin
4a86f40efe2f9c53cd6c5d54158079cafb4e249c7b37b8cccdf7e7ff321b2ca1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA5F 17520 bytes
font_01_sfnt_off00011867.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11867 16792 bytes
font_02_sfnt_off0001307e.bin
83539a75ae12885d27927a52e0827c1b7f821f66caeb7f8d792eca837e9b473b
pdf-font-stream PDF embedded font (sfnt) at offset 0x1307E 10808 bytes