Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1239c39378db570…

MALICIOUS

PDF

125.6 KB Created: 2021-06-27 19:46:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 324806621419fd2ca997088885981abb SHA-1: 4ac1789894b256f0d47c24032d2b3c653515815e SHA-256: d1239c39378db570b215ee071a607d64728d701bfbd492298e372dcc4553d6d1
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/16086e0bb02f30---96448326272.pdf
    • https://addsfly.com/userfiles/file/33215125568.pdf
    • https://hyundaia.ru/userfiles/file/vakifafe.pdf
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/j6vbdt3crs35q9s618hj8j89rt/57559411.pdf
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160885f0202dcb---77025376264.pdf
    • http://dokumsuzgec.com/userfiles/files/befurolabevifewefubesagow.pdf
    • http://hainescentreasia.com/images/file/45276547462.pdf
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160b9d180bf384---15861041722.pdf
    • https://go2germany.ru/files/file/sigibiwofa.pdf
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/16086a44931883---zikepejilolimejumoz.pdf
    • http://chamdure.com/DATA/files/84723401199.pdf
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/917tnk4r25jgkg37mnu0qfgur5/21811161752.pdf
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/sidl46ddt41fi3ech6sbtciat7/zonizib.pdf
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/b52fe002000dbcc4489253d814fbf665/17049363985.pdf
    • http://metabolit-plus.ru/files/file/vimeguk.pdf
    • https://solo-enoant.com/content/files/files/womubasebifovi.pdf
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/b42b76ab5e3bf79ee3ac674558a85784/52346424603.pdf
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c2ffefd03fc---tobajumubukofemisifajivog.pdf
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160aa1e72f2258---83842190842.pdf
    • http://dailymaydemtien.com/userfiles/files/74439552902.pdf
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/e8789c220519465caf80a4c9e597ac17/70149438992.pdf
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/fbocpa2kio9aoqhdr3esm67asv/56404352293.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=the+relic+meaning
    • 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_off00016ddc.bin
8d086b8a3758af08f38c16c83b409030ad7622be3b87e5e12ec8a422ff5ede65
pdf-font-stream PDF embedded font (sfnt) at offset 0x16DDC 1968 bytes
font_01_sfnt_off000176f1.bin
88bb7f9d51fe05cb93c273af756f8999cd35a523445f65712184eefaa0ad7d4d
pdf-font-stream PDF embedded font (sfnt) at offset 0x176F1 27088 bytes
font_02_sfnt_off0001b8a3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1B8A3 16792 bytes
font_03_sfnt_off0001d0ba.bin
3a6cd8776c4a5fe2f6397ed2955242934dd5f89341b3bbd21cff8813b96c510a
pdf-font-stream PDF embedded font (sfnt) at offset 0x1D0BA 10252 bytes