Malicious PDF — malware analysis report

Static analysis result for SHA-256 11fdb62b2ed38299…

MALICIOUS

PDF

74.6 KB Created: 2021-09-05 18:55:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 51aab92ddf835d35ef3e87d4a0acbeb8 SHA-1: 90a959fb896297c3e386fe864009477d5063bef2 SHA-256: 11fdb62b2ed3829996c542b487f07c48051c7d8221ed1af53bb0625eb8ad95bd
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external URIs, many of which point to compromised websites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

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://archism.ru/uplcv?utm_term=se%C3%B1ales+de+transito+pdf+el+salvador PDF link annotation
    • http://kasargod.net/uploads/file/52613387628.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082b1be2fcad---68942595857.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/4i7ctg9vvl59n71rfe6ev92q98/54506324895.pdfIn PDF document text
    • http://patroha.hu/file/derugagepipe.pdfIn PDF document text
    • https://immobilgold.com/file/xexevufagefazakilo.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/8aa37311a9eb16ad045b53bd7699faef/xuxudegikatanukepemux.pdfIn PDF document text
    • https://mattress-leader.com/media/14656074621.pdfIn PDF document text
    • https://vivekanandbawwa.com/userfiles/file/zimadefu.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161218d56cdad2---99994029594.pdfIn PDF document text
    • http://dwallacelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/maretulipawuwakikafowub.pdfIn PDF document text
    • http://gw73patriots.com/clients/1/1e/1ed986c9d410becccfd9995a8318e329/File/mubisof.pdfIn PDF document text
    • https://csmgh.net/pevron/www/img/file/fosuwubajere.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/427a50085825ec651b76212d2652fd48/49421807465.pdfIn PDF document text
    • http://leoclubmarsala.it/userfiles/files/tomewatokudalujov.pdfIn PDF document text
    • https://sonarmusic.hu/up_image/file/4131581260.pdfIn PDF document text
    • http://multifamilyfoundation.org/clients/3/38/38c33163524538bb895552046de0b362/File/xijujetodikone.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c67c87d4894---pevijas.pdfIn PDF document text
    • http://pvhs1967.com/clients/a/aa/aa78cb05297cd93d8a9ab6bd1eb8a3c4/File/74181162792.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/f9238af36cd200efddadeb9d7602c797/52486233913.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/punex.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/16109e15d4c4eb---wipabijavajunapazugoxi.pdfIn PDF document text
    • http://calzaturificiocatia.it/userfiles/files/35431034761.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd80ec9863f---majojadedonoxo.pdfIn PDF document text
    • https://eviinstall.com/userfiles/files/zubupelo.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/52533932535.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/14883389959.pdfIn PDF document text
    • https://pasarantogel2.com/contents/files/xiligipejugetet.pdfIn PDF document text
    • 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_off0000bd7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d591.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD591 10836 bytes
SHA-256: 37cda107762fc00bf846201938ffc447c407f0872b709bacf7cc581448d4fcd0
font_02_sfnt_off0000ee70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE70 17332 bytes
SHA-256: 50ae93e9386a10782312ac214ea5472479e7a301fc533d7efadc8c7b6f7a2445