Malicious PDF — malware analysis report

Static analysis result for SHA-256 55731ea33c585953…

MALICIOUS

PDF

94.1 KB Created: 2021-06-26 19:48:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: df7eaffcefba87663e9ff77e3f0397f9 SHA-1: 00ba4339d2b80036eb8090f78ef5a9eb30e51aa4 SHA-256: 55731ea33c58595327f044dcad8b36aebca307992b96b1005826b62ac825b5b4
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous websites, many of which are hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farm heuristics supports this conclusion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/6e71bc8b1becb2265539da6ffa1dced2/60406059171.pdf
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1609f72c7973de---60301582793.pdf
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/91gt698bid5lqhdj82ut852e59/mirimo.pdf
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/414ac8230448915126018d9922e04084/75572477682.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1609ccf931125d---81806007974.pdf
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/fb9e1207d05e9ccfd788e867a78f36be/vivadekugikifilexob.pdf
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/039e99ee5d24b7417fb4c65bbc96fb42/sesudunesijusavagotimet.pdf
    • http://bajajsports.com/userfiles/file/46350957117.pdf
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080b96cabb84---vitezivarudixuzi.pdf
    • http://josephlillianmorrisfamily.com/clients/59960/File/70386419836.pdf
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160cbeeafbdef8---4089888705.pdf
    • http://doubletroubels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160744ae47c0cd---lorugonumujagez.pdf
    • http://hart-metale.pl/gimnazjum/userfiles/file/balare.pdf
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b18ce94e6---68513423393.pdf
    • http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pototop.pdf
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a6af6327e57---38398786991.pdf
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16084b44d679ba---84113022209.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf74ef462da---31518316275.pdf
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/a6f1ae5664d411b262fa02636adca843/senojivabasosozuwamotesep.pdf
    • https://carrieres-pierre.com/userfiles/file/zudafasadodezapibumaluru.pdf
    • http://www.toptehnik.si/images/38352721533.pdf
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16088484ceba64---55443235821.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=cod+only+apk
    • 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_off0000f7f8.bin
d9f47a0be1a12801b7523f8e887168a6f039263d8a39ac2e77d014e2c91d8bef		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F8 10032 bytes
font_01_sfnt_off00010e54.bin
cd50eb7aab2f0e9a52beae6abbcea2f1f43057679cc4dd188eaef8d3d32b48e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E54 16292 bytes
font_02_sfnt_off00012416.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12416 16792 bytes
font_03_sfnt_off00013c28.bin
3f07fc98b045b2df96bb6974c82923277d16ffbc7855a002064717afec40f7a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13C28 17964 bytes

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