Malicious PDF — malware analysis report

Static analysis result for SHA-256 44d1bb85f5d82117…

MALICIOUS

PDF

91.6 KB Created: 2021-09-12 22:42:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 67fc9b70c16703f06af47acf5508c656 SHA-1: 82ff52d1181c90801e4a09b04292cd538543caf8 SHA-256: 44d1bb85f5d82117cd976366205fc63ec991ff195e86bca0e50ac0e66765e4c3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to websites that appear to be compromised WordPress installations or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. The primary attack pattern observed is the use of a link farm to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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 http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac0f92deab---kifixadilenuwugovotukor.pdf In PDF document text
    • http://debnine.net/UserFiles/File/93171469207.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210906045354.pdfIn PDF document text
    • https://xtremefitksa.com/ckfinder/userfiles/files/nudakanibisivosi.pdfIn PDF document text
    • http://mywayrtk.org/userfiles/file/947408301.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/m35cmnf1hg8bi155g4sv93c8bo/58722825716.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/fojisajopadumuzokutiniri.pdfIn PDF document text
    • http://www.catedralirodahaz.hu/data/editorfile/tamefububazifipi.pdfIn PDF document text
    • http://bridgestone-ice-cruiser-7000.ru/ckfinder/userfiles/files/lajuwesatuxuzavepekewosar.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/giwidamor.pdfIn PDF document text
    • https://seedomoretravel.com/files/files/16969778226.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/39109302508.pdfIn PDF document text
    • http://aostavet.it/userfiles/files/83825396276.pdfIn PDF document text
    • http://dream-mebel.com/pic/file/75914187544.pdfIn PDF document text
    • https://bselink.com/userfiles/file/63342982914.pdfIn PDF document text
    • http://zatoodesign.com/userfiles/files/nizisuvofoxikizodo.pdfIn PDF document text
    • https://bisleri.genefied.co/ckfinder/userfiles/files/zutosovafovo.pdfIn PDF document text
    • http://bscartridge.com/pic/tuxutazorodetafiz.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/161341431f1b3a---71811975592.pdfIn PDF document text
    • http://cbcom.fr/ressource/site-image/files/pevirukarefomapajowuwetos.pdfIn PDF document text
    • http://erdbau-rauch.at/nedotagozumoxuboxa.pdfIn PDF document text
    • http://xszhuhai.com/uploadfiles/files/46532835602.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/69093233051.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013/admin/ckfinder/userfiles/files/vevivifokuron.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/8296850047.pdfIn PDF document text
    • https://abhimaninteriors.com/ckfinder/userfiles/files/walajopumovoregi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=equations+with+variables+on+both+sides+fractionsPDF 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_off0000fce9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE9 19236 bytes
SHA-256: 04f324ef5e53d3fe063be030401af1722bf927151d3475f3cb813a0f547c1330
font_01_sfnt_off00012ec6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000146dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146DD 11092 bytes
SHA-256: 57ea978b6b757f4d719a92cb646e87a0cfdb89c96aea91ef991a36bbef7d805b

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