Malicious PDF — malware analysis report

Static analysis result for SHA-256 41abe8581749a0e1…

MALICIOUS

PDF

112.2 KB Created: 2021-07-19 20:29:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: ec358586aa2d079f80d937f8571d403b SHA-1: 88e70d4e4a3ceebf5ba5ae901069ff0cc0a37b42 SHA-256: 41abe8581749a0e18f85f714e596df6ea8e6a373e9e3c1ef7df64488e56ae90e
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting. The document body is heavily obfuscated and unreadable, suggesting it's designed to hide its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9279

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1609c82dd730e5---womowuvatezebenavelad.pdf In PDF document text
    • http://goraku-sangyo.com/userfiles/file/kodipusiderakupe.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160cd31a5ca2d7---pitenovatupalisosas.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/91866863721.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160865a2952ef3---movemit.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/xolalagigufefezakogogidej.pdfIn PDF document text
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/imcdnuqa99j700ol6acl4kb509/51400910521.pdfIn PDF document text
    • http://bobmeetin.com/media/galleries/files/52295651842.pdfIn PDF document text
    • http://ladyvenus.it/userfiles/files/sosagi.pdfIn PDF document text
    • https://alperbehang.nl/userfiles/file/tunup.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160734dc614c61---68645788157.pdfIn PDF document text
    • http://allnatureint.com/userfiles/file/3603896096.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607450ef4fc93---28766229362.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609432bd1e69c---webil.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160bc38c28246b---68168299003.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/opvi4hksfolggkf4s8ac07tlnm/wutonifa.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad98c71c5e---zekexemilolopaxo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983ed973f79---kijaxudawonevu.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084d976bcf6b---55555458903.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ee80cef50---83700473964.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/9u62e6c21md2qpuihgbfujh210/38252588638.pdfIn PDF document text
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/s0egrtvvf1m051tup64c2814p2/pujusodifonemetas.pdfIn PDF document text
    • http://ankaraeksioglu.com/resimler/files/26442388273.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/f3c45e982b338bde5626ea5634c6c740/34854146991.pdfIn PDF document text
    • http://ruegen-ferienhaus-schneider.de/userfiles/file/96781030070.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/013391ed6f80ca4db470cd044ee1aafe/776121448.pdfIn PDF document text
    • http://thaoduocquyhiem.com/userfiles/image/file/418122383.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=tire+puncture+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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00014927.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x14927 23276 bytes
SHA-256: 39d015775b4663eed511dd271a0c0740f32fee65972f50428c7814043a123858
font_00_sfnt_off000107da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107DA 26804 bytes
SHA-256: 90a49857c05b15ce5daa7cd7e56c6c554cee7004a67c712987e72811cde4ee73
font_02_sfnt_off00017373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17373 10432 bytes
SHA-256: dc0c7d826e5562ddd01420b49859716587b0f308427577386f10f32c0edd5bab
font_03_sfnt_off00018b01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18B01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off0001a30e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A30E 3864 bytes
SHA-256: 73d1aa02e1208793255fc4c82697e1a9a3457d23004bd78c80b33f1798eaae72

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