Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d6187f6a0d82522…

MALICIOUS

PDF

82.6 KB Created: 2021-07-12 23:44:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 43d0afa542c68808e0106f5c43fce2b4 SHA-1: 1ef8cfffd62b86a8e38064155c79a3595d8652cd SHA-256: 2d6187f6a0d825222e84fdba27fb23debbe6e26860f61a39b649342c33ac61a2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The document body is unreadable, but the heuristic firings indicate a link farm strategy, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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 https://jbdclothiers.net/emailer/userfiles/file/nufovawijuxu.pdf In PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/2979fd04d1fe51db771035990868a0b8/batewe.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0250cd6592---30753339825.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094824dd1486---40745728019.pdfIn PDF document text
    • http://makingthegradetexas.com/clients/d/d4/d4716c73f098ea79da165a2194b6736a/File/vavigaresivinivolozonusex.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609b389b47066---bawumubotazizer.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/e0vepljbu8rd3khkb0hjm702hh/92654892865.pdfIn PDF document text
    • https://andrejc.si/files/file/fubulagadipaselugujoxepu.pdfIn PDF document text
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/9i2g802ihk7ba4qst7b0act0i3/55736935228.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/06c2fec56040cae58acf4b862ff1c950/gaxadujapatokoritixipu.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609db49f44e1d---dudelepagisevaximaju.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/logulowa.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/16166294010.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/64825994279.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cbf9f96248---91784457406.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16098a1d50f111---97147482870.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/2212154239.pdfIn PDF document text
    • https://nestuby.com/userfiles/file/29016197828.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/64163440551.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/22lho59uuuucabno5ltf7qh5rh/fifejiximakujotunigilujex.pdfIn PDF document text
    • https://campermagazine.tv/public/file/fixagurepibez.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/lenuwepuli.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a075bdaf3c3---vukujerutinu.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/16ab5affd0dd87d4c47f9317854cfa34/romijanivexod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=mediocre+in+englishPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d35e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD35E 10384 bytes
SHA-256: f1cb9c266336bcc451b9a5c4da1a2cf08271a9625875694358c7bb99697c879d
font_01_sfnt_off0000ea78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001028a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1028A 19080 bytes
SHA-256: f5064e5a7cdbba8e8255a0cbc4ca535ac11407e36588acb1afb418de146af10a
font_03_sfnt_off00013491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13491 1720 bytes
SHA-256: bb43a141501f42932694c859ebdf6aecc7f12bf4ac5b20e48008c887f64208c9