Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cd400199fe6ead2…

MALICIOUS

PDF

119.3 KB Created: 2021-07-20 18:35:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 21550fe0ff4ffa1a0726a733098b07e0 SHA-1: 3c009fc760c4fae6214418cb86769c0145d0b141 SHA-256: 6cd400199fe6ead28d66c1fc52dd9ba97096d13f4282a48aa1b16124446b3aa9
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. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and link farms indicates an attempt to lead the user to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://ive-cal.it/file/tafidotutemuxi.pdf In PDF document text
    • http://bscsaoner.in/ckfinder/userfiles/files/dovarezulal.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/p19tkasre0mfdollfa5virptr4/juxegopura.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/79681247879.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/3ce1c7c0309009b953a91c5c70b68883/wijibel.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/63682451298.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ef88dc875---milifuwakogolawopani.pdfIn PDF document text
    • http://wellnesszeewolde.nl/site/data/ws/files/50838968041.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/hpla2jf5m086i7peibod0j3bve/70573168144.pdfIn PDF document text
    • https://hurtowniaroza.pl/upload/files/82256579349.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6b9691e56---13051609822.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/zuvovuparizo.pdfIn PDF document text
    • http://masseydogs.com/clients/f/fc/fc2e217ffa4851e49ca3cd921a15cf41/File/wubuxarireb.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210517183409.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cec2a81a12---migomuxokar.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160803af656183---14890769453.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8c766dfa7f366f8d4a349964a6973876/dasonabosoxezokekiximito.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/2bj1fqgb2a6lmaimikd29u3p9h/16622942151.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16071a3d54d5f2---voveradovenewuvit.pdfIn PDF document text
    • http://zxsolar.com/d/files/93025300834.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c68079a128---rujigapuzixadusukusime.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/a63ec10700308d5d2f6a0c88a92830d0/rageroxuzupagexidev.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/cfa53a8c6ea18442f79b8b2dfd78b8b2/zavebagiwarolik.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/nadafovinuwepapujiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=chapter+5+industrialization+and+the+gilded+age+answersPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016e53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E53 11084 bytes
SHA-256: 9d5d555b9bcc7b1f641b12d73fe46cb735f9f75ef304216482841542a9dba0a4
font_01_sfnt_off0001880d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1880D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001a01f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A01F 17432 bytes
SHA-256: 53aff0859bf72a5a5fb4937d1642b3af4d5bac5e64ff92b2959cfef072e4b5e1