Malicious PDF — malware analysis report

Static analysis result for SHA-256 20f98e07a3c13372…

MALICIOUS

PDF

85.9 KB Created: 2021-09-16 20:16:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c324f6ce334d1d3e9c9ca386e20df5d0 SHA-1: 95d012482fe0039b7d61c90f34f15af8716fd251 SHA-256: 20f98e07a3c13372ca4b653336221a1a26df6ab7688dd2671df3b92f9b4f2fa0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection T1204.002 Malicious File

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm with numerous URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The primary purpose seems to be redirecting users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://irlanc.ru/uplcv?utm_term=best+football+games+for+android+offline+under+100mb PDF link annotation
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/9671dd5ed35caac67bfc382f76ced4c1/48730317766.pdfIn PDF document text
    • http://officegate.biz/admin/fck_upload/file/64180692195.pdfIn PDF document text
    • http://polins.org/public/userfiles/file/46388559599.pdfIn PDF document text
    • https://www.idd.no/ckfinder/userfiles/files/lapidinipilakanupigasuv.pdfIn PDF document text
    • http://karaokejdi.com/ckfinder/core/connector/php/upload/files/mofev.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/66217340845.pdfIn PDF document text
    • http://mtkshop.com/images/uploads/file/22347921765.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/37469504925.pdfIn PDF document text
    • https://ghadir-eng.com/userfiles/files/1712028332.pdfIn PDF document text
    • http://ylplj.com/ckfinder/userfiles/files/xavirokotudifudibelarefar.pdfIn PDF document text
    • http://lifecontinues.ru/images/files/mudopedagosoxeja.pdfIn PDF document text
    • https://banghenails.com/upload/file/83902408531.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/bibexiredikumogupamigimip.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613a08fa5ecfb---tewetoniwababa.pdfIn PDF document text
    • http://recko.ru/ckfinder/userfiles/files/45904459053.pdfIn PDF document text
    • https://ehotelgateway.com/bot/ckfinder/uf/files/nidat.pdfIn PDF document text
    • https://vietrocknet.org/app/webroot/img/files/91680777449.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/penonudozijaxo.pdfIn PDF document text
    • https://kompaspt2.com/contents/files/xotix.pdfIn PDF document text
    • http://thuocnam.xyz/images/files/31039015315.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134fd09d9bd9---19439850149.pdfIn PDF document text
    • http://www.srijonihealinghome.com/fckimages/file/viwazajovogate.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_off0000ec96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104AD 11164 bytes
SHA-256: 403eefacf3302ea5ba22d2b16041ab1d7946f6cdc572c0cb5b10e90f4e184d32
font_02_sfnt_off00011e99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E99 16604 bytes
SHA-256: d97b0aa8c97bb1883ff0600d32acd0f66d088746b6c8321b678cba84f0fc9d01