Malicious PDF — malware analysis report

Static analysis result for SHA-256 4464b724b9644bd6…

MALICIOUS

PDF

148.3 KB Created: 2021-06-25 12:37:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 28ebdb03b51223189d001851f7edcbd3 SHA-1: e891022ea9141d4dc4dd1fd1fc8cbfff4fc112db SHA-256: 4464b724b9644bd6b9f2a841b043bf5bbad21c37220ef6a6d939a7f44a0fdc65
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. It contains numerous URLs pointing to compromised WordPress installations, suggesting an attempt to distribute further malicious content or host phishing pages. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates a common tactic to bypass gateway security by encrypting payloads, which are then decrypted using a provided password.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096a1d943c2f---zupavivakuvaxubefope.pdf In PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16080933883df7---boponapukizoxur.pdfIn PDF document text
    • https://www.myosiaffiliate.com/199trust/img/file/3625903841.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160826206cc7ae---gunuboxazekatujib.pdfIn PDF document text
    • http://maxtarget.by/ckfinder/userfiles/files/71752394931.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d3a40a634---jivububabekebevipufifugu.pdfIn PDF document text
    • https://anakmeong.com/contents//files/bitakubebesivizofoz.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bab3927bbfc---57864220081.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/2fmeqihv0m2n8ouuelkif8pm5n/wapogiwusaxa.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/27163c759d660b07f26e9453d5e05074/juwonanep.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/5a29d3fba65974071185397f4c919c69/85439261574.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/6bcb3cdfd861d9a2173d42a312cfca7e/fejamo.pdfIn PDF document text
    • http://habitat3.eu/userfiles/files/wejusesivegilibetavaponet.pdfIn PDF document text
    • http://expertcomptablecourreges.fr/michel_courreges/userfiles/file/97015560924.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/cf60a9a926011b9f89468fe5d9c58532/75031864890.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/2d22b3c7ac76a84f09d0d429b5451c76/65835488025.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=sun+netra+t2000+service+manualPDF 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_off0001d064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D064 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001e876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E876 21240 bytes
SHA-256: 6eed01c699e3e44e23c3207b66a4a04b732d05888f5fedbc4878eca51a21707c
font_02_sfnt_off00021f6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21F6F 10752 bytes
SHA-256: c32761c5a6b8bcd7599967578c0038b9b8d5937435f4fb97d88ad177edc820af
font_03_sfnt_off0002383c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2383C 2828 bytes
SHA-256: 64894b9746860d5e23a32d016db2c8e950b74fa1fbdc18b56bae19276039a1cd

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