Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b2a00427c185631…

MALICIOUS

PDF

81.7 KB Created: 2021-09-19 01:30:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5f649e71bae0c025ec929249213f9e3b SHA-1: 24d3c6142583c32e16e35078512381dd6d6be4bf SHA-256: 1b2a00427c185631a70ad3932c4056f937bbef00cb39692b9752b33927af4161
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to compromised websites or domains designed for link farming. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to serve as a landing page for further exploitation. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://wastran.ru/uplcv?utm_term=pattern+recognition+and+machine+learning+free+pdf PDF link annotation
    • http://hodinovysoused.cz/upload/file/lavasojowixasowinulomi.pdfIn PDF document text
    • http://shopsuathientu.com/uploads/userfiles/file/14538899314.pdfIn PDF document text
    • https://successalpha.team/upload/files/wununukalomojazasa.pdfIn PDF document text
    • http://nieruchomosciklodzko.pl/files/file/vabafomagaponunulajo.pdfIn PDF document text
    • https://adian.eus/files/galeria/files/fawazinazuxofonago.pdfIn PDF document text
    • https://curewelldiabetes.com/userfiles/file/83243086348.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b774f1fe87---kupizesebali.pdfIn PDF document text
    • https://proetcontra.hu/userfiles/file/sokem.pdfIn PDF document text
    • http://udokutscher.de/gfx/userfiles/files/20851445424.pdfIn PDF document text
    • http://1night2daytour.com/ckupload/files/zipisovixemizukuvima.pdfIn PDF document text
    • https://mahanakhon.pacedev.com/ckupload/files/rewad.pdfIn PDF document text
    • http://samwha.com/upload/userfiles/file/nakosolijudixedisovanadu.pdfIn PDF document text
    • http://ortosprendimai.lt/userfiles/file/70192718238.pdfIn PDF document text
    • http://terralis.net/catalogue_dynamique/file/14140599199.pdfIn PDF document text
    • https://crownprolaw.com/userfiles/Proj_Name/files/31033377138.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/jt1o9t2b299f1rqigltqjukg00/27609927605.pdfIn PDF document text
    • http://uralteplostroy.ru/content/file/40260158140.pdfIn PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/rosigafaj.pdfIn PDF document text
    • https://lentes123.com/aym_image/files/85292346727.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/q6hi0j5l21vqdh97h5vhho9ee0/mitekilagojotamojupovu.pdfIn PDF document text
    • http://millenium.moscowfashion.net/content/xuploadimages/file/wopesi.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/barod.pdfIn PDF document text
    • http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///zivukubam.pdfIn PDF document text
    • http://111-orte.com/testarea/cwsCMSlight/media/files/zoxekufarezozelatenub.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_off0000daa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA8 17568 bytes
SHA-256: 77591d88a9c8352bfdfa4391004b35e04cc6518a4cad81921ce937cdcd61b5dd
font_01_sfnt_off00010804.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10804 10900 bytes
SHA-256: 4e5eb74a79b237a93570462a12c0effab2451e22017e3a22039d73c73d00e2d4
font_02_sfnt_off000120cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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