Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad7b2eef194de8c6…

MALICIOUS

PDF

86.7 KB Created: 2021-07-05 07:28:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0efbcb57cdbb062b5219ac311fd43420 SHA-1: d72a3244a9bb741a4ea7896abdcb50a9be0b6062 SHA-256: ad7b2eef194de8c6c35ef15d6a643cadc03b3485809562b3210799cbd2df8a62
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as a link farm, directing users to numerous external URLs hosted on compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/7e499c3ba6320884c2fe637474295d81/81240438943.pdf
    • https://kartplast.com/resimler/files/xuwadiwupik.pdf
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608074a18cd21---78439840701.pdf
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/937d4291aee8d59dfb7c14215ef761ce/kegekibexu.pdf
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/a096cad6d99e55ad06920827ef3e9961/50395667341.pdf
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b0b764349f1---dexatejigawufapud.pdf
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb80ea49a5---jojokixedowogiwedumaku.pdf
    • http://studiofranzoni.eu/userfiles/files/dafizobowazozikumupidaro.pdf
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608920fa6237e---45803277057.pdf
    • http://tablica-nieruchomosci.pl/uploades/fckeditorfile/41855164587.pdf
    • http://anaminfo.com/attachfile/file/makejesububejaxuj.pdf
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/54d4d7a82120033ebce514771cf8da22/89429720538.pdf
    • http://businessdevelopmentcenter.pl/uploads/userfiles/files/zolatexesefudopamufurepak.pdf
    • http://goteneplast.se/files/images/file/lepodefosazubawap.pdf
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0bf8a468d4---tagegebason.pdf
    • http://lucann.com/Upload/file/7199010921.pdf
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2471db1abb---74699160730.pdf
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16080a10557da2---kadizo.pdf
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160ba82c78b24d---5361121436.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/7vnrr1vu0tk9bt0mn1im01l50j/77815924792.pdf
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/2f78bc4bc0bf6635179427732897e802/sukagizuwirudisabisu.pdf
    • http://agendaalzheimer.org/files/galeria/files/lasisugafenikiki.pdf
    • http://automozg.by/upload/editor/files/getuxovef.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=weathering+with+you+anime+english+dub
    • 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_off0000ed4c.bin
74bb874b07cc134c36f1b838b490e56c2d6e790b08d5e404c6de4207c75ebf1d
pdf-font-stream PDF embedded font (sfnt) at offset 0xED4C 17716 bytes
font_01_sfnt_off00011b8f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B8F 16792 bytes
font_02_sfnt_off000133a6.bin
f805ca1a2a8cf2e125bf15127388a6949a426b448183a076d7f2a81839b19ff3
pdf-font-stream PDF embedded font (sfnt) at offset 0x133A6 11128 bytes