Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a57f428940b28cb…

MALICIOUS

PDF

84.0 KB Created: 2021-06-26 19:19:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 25b00a0dc99f7bf936304fb0b9b3340d SHA-1: d3768c2522973c8625b676e4bb7c09a0c5f4968d SHA-256: 9a57f428940b28cbb9b91db49a19bd8875775dbb78ef4390b144599bc3a2ff66
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm containing numerous external URIs, many pointing to compromised WordPress upload storage or disposable hosting. These links likely serve as lures for phishing or to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://lroundup.com/clients/d/d7/d7466da0ad72d96b64793f89c518a0d9/File/93316264514.pdf
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/509l492fb3i4gq294302ehmob7/nutijidezejutazirapipe.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d808d3454b---13147445167.pdf
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098364a490ee---35491229888.pdf
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607934792a781---62891518252.pdf
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/f00cb493304cd9946c97e440fa6bec8f/fuvilebawiwomirilisezev.pdf
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c5f3df03001---56200166902.pdf
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/eoiidf99p31a940s8emn9rjgdv/givotikotu.pdf
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/3b4de27825c1a7abe0b1d96847223933/foginasawojuromomokulud.pdf
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/546c790ba345a523a37ed40828d72aca/lanora.pdf
    • http://ypcalumni.com/clients/2/24/24042806289e0d450134266962f0a0d8/File/pegifoxizixejutegagetu.pdf
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160c24d3529b6a---30471885326.pdf
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b6b69d57c78---13586334119.pdf
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/ci8gkpgh60d1ih9dio6as7ahq7/32647623812.pdf
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/ed757cb9a7121158757886ff4ccf1177/zepenuxufarosez.pdf
    • http://villa-carlshorst.de/sites/default/files/file/ledebevebedodukelekupog.pdf
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/8d2c5e94f7e6531c63e0d8e170a7467f/64281597047.pdf
    • http://1careglobal.com/upload/files/6988795251.pdf
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/33c75ee64e0e89f2c8ae526bff73e2ce/xuvemoxigironivaser.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/08e9b7ea5de852bdf09a51b50ae938ff/guvijogafuvixavog.pdf
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/baec65ec44184a6314bf175d60c2d4af/bavurunejafefi.pdf
    • http://alliance-ltd.com/userfiles/34374735259.pdf
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a0cfb1725b3---16143486796.pdf
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/fd721ad85339ecd69804ca966a356588/8905919532.pdf
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5be91caca---vilesutojovanixutuvap.pdf
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/5dd40ae426a93d4e0fa8636b346472f9/dodikudejupivajiwud.pdf
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/efo6t6af5j2cok9su9dcqhjclv/nagogunelapopomomomogosan.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=above+all+put+on+love
    • 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_off0000e7c6.bin
7ea90036ce49fc28392ece410923a89b73e0129a89ed8e7ff1c95e5ec1c0dd8b
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C6 16968 bytes
font_01_sfnt_off0001141d.bin
c425fac26ef13cd070ad04d88f93099f8c09b9449ae7e72bbf01cce9b1e28d6d
pdf-font-stream PDF embedded font (sfnt) at offset 0x1141D 10172 bytes
font_02_sfnt_off00012adc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12ADC 16792 bytes