Malicious PDF — malware analysis report

Static analysis result for SHA-256 a620a8c018358406…

MALICIOUS

PDF

81.3 KB Created: 2021-09-15 21:42:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 992985997c5a64ba3448e4aa6f62d50d SHA-1: 2d102998ee57468f131cbe69667bfb914eb535af SHA-256: a620a8c0183584068a9736e6ff771ebb8103b2293a9e8a581c405104b25692fa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, forming a link farm. The document body is heavily obfuscated, preventing a clear understanding of its direct user-facing content, but the overall structure and heuristic firings strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://dom4m.de/userfiles/files/xajirikalukawukivu.pdf In PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613334a30aabe---47720550411.pdfIn PDF document text
    • http://geosond.pl/userfiles/file/xeteneb.pdfIn PDF document text
    • https://thebillionbottom.com/business_school/uploads/file/9786464215.pdfIn PDF document text
    • https://australiancaravancentre.com.au/application/third_party/ckfinder/userfiles/files/tudususuxog.pdfIn PDF document text
    • http://hqshop24.com/userfiles/file/kiguwari.pdfIn PDF document text
    • http://budaors.varosom.hu/userfiles/files/42227468096.pdfIn PDF document text
    • http://jogagongu.pl/userfiles/file/kanakofukisifuri.pdfIn PDF document text
    • http://mtcongnghiepxanh.com/upload/fckimagesfile/suximuxo.pdfIn PDF document text
    • http://nuklearmedizin-amro.de/userfiles/file/joxemosetalarogunopelana.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/006f476157181d34ee46fce5369c8fe8/lasufelogalijasufilovuvaj.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/16138b23c5f918---rexinalovasivoxefifo.pdfIn PDF document text
    • https://autoprofi.ua/userfiles/file/43579338769.pdfIn PDF document text
    • https://epiphanych.com/images/file/55278152005.pdfIn PDF document text
    • http://happyorderfood.com/uploads/files/11359749745.pdfIn PDF document text
    • http://tonioloclaudio.it/userfiles/files/venoxibujima.pdfIn PDF document text
    • http://elma-itc.ru/!upload/files/nutexesemimi.pdfIn PDF document text
    • https://network-italia.it/file/woladogoxa.pdfIn PDF document text
    • http://adec-interiors.net/Uploads/file/xizixanat.pdfIn PDF document text
    • http://webbyshoe.com/fckeditor/userfiles/file/40011050947.pdfIn PDF document text
    • http://kangshi-you.com/uploads/files/202109061908058833.pdfIn PDF document text
    • http://mosme.org/uploadfile/files/16095292342.pdfIn PDF document text
    • https://medius.sk/userfiles/file/karomugodejizebu.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161415ad0da188---bixifilujeripujikapa.pdfIn PDF document text
    • http://myphamasia.net/upload/files/14430597376.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613faca541700---minajivuvumaxudet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=example+of+distance+in+physicsPDF 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_off0000d857.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD857 10984 bytes
SHA-256: c152c3b0f3620d467251c0b107e46635151c719a6cff381688e4adbf9d693eb1
font_01_sfnt_off0000f1ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AB 17884 bytes
SHA-256: 0dc45b242647ce2a61d3069e33d86ed8c2e7ced88ffe3e9bcfc424763de9434a
font_02_sfnt_off00011fb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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