Malicious PDF — malware analysis report

Static analysis result for SHA-256 91629ecdd3e61d3e…

MALICIOUS

PDF

92.9 KB Created: 2021-07-16 05:00:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e2e950a33122e3e4367166fc3c0a5b81 SHA-1: 887d5ee49ae8edcd3563a160bcacdf92ffc72400 SHA-256: 91629ecdd3e61d3e917b8766b75a8c45576a4413594ad02c677d6e2d44d55a52
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or link farms. Heuristics indicate that the PDF is a link farm, with some links hosted on compromised CMS uploads. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/be60fb27afd81ac6a9c6588ea88a1946/35356962358.pdf In PDF document text
    • http://bearings-home.com/userfiles/file/bitel.pdfIn PDF document text
    • https://gastrotest.co/ckfinder/userfiles/files/34677379311.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16070a41e45bc6---sikuwukewixapijirod.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/fupikajoxudelir.pdfIn PDF document text
    • https://whiteplacard.com/UserFiles/file/xosilividir.pdfIn PDF document text
    • http://officinedesign.it/userfiles/files/30268261860.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/4veffp37soflhkpdncu6tr86uo/nijezixefigimugivezani.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c92a4e8cb6---xijinoxunivi.pdfIn PDF document text
    • http://orhs89reunion.com/clients/77823/File/51134951283.pdfIn PDF document text
    • http://vdtonline.vn/static/uploads/editor/files/48525369709.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1608fdf777e63c---95141076832.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/t57i1086bqd7ihf6j57argt557/73268185153.pdfIn PDF document text
    • http://filatelianumismaticaumbra.it/userfiles/file/84525754854.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/rezixizododuwuxirov.pdfIn PDF document text
    • http://harrisonfamilyreunion.org/clients/868801/File/joguxe.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/wopuwukikiwuralonaz.pdfIn PDF document text
    • http://edanieltour.com/FileData/ckfinder/files/20210529_1A9EA172C4DD42EE.pdfIn PDF document text
    • http://avision-italia.com/userfiles/files/perurirorekekamuxo.pdfIn PDF document text
    • http://pumarecovery.com/userfiles/files/87935499360.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609269629b660---mugubodezub.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c5b962ecab3---rasuxapasalub.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/18512019486.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160735332b2022---5976036231.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=munchausen+by+proxy+support+groupPDF 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_off00010950.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10950 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012162.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12162 16756 bytes
SHA-256: dad842dec4758ca977eaab057b93119b7ecba029f02c5f0a84cff586f7316849
font_02_sfnt_off00014cd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CD7 10964 bytes
SHA-256: f0632e6d7d1d7bf89d307bad3493d3c67d620a4cf529af499c1b75848cf2cecc