Malicious PDF — malware analysis report

Static analysis result for SHA-256 89f61790f5e3a212…

MALICIOUS

PDF

96.8 KB Created: 2021-09-17 00:14:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1ff9b8ae3e7df8ee04241efe96dff4df SHA-1: 90c1e1a45ee6addc798d15893f442967ad58bcdb SHA-256: 89f61790f5e3a212269b8626bca6fa63b362e5485d3e7ecdfbf181ed9c243aa3
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9895

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 http://www.oneworldkarate.com/fckeditorimages/userfiles/file/22664834608.pdf
    • http://jrpst.pl/userfiles/file/32852644114.pdf
    • https://weilmclainboiler.ca/fck_upload/file/55676258741.pdf
    • http://qataminational.com/uploaded_files/userfiles/files/fadipasaw.pdf
    • http://trevelsi.ru/ckfinder/userfiles/files/xarokavuzateb.pdf
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/hbmdv5khp7s8hn1m6bcebmem37/vesovawor.pdf
    • http://yummyschool.com/_UploadFile/Images/file/33340378789.pdf
    • http://dieterheich.de/images/uploads/file/47655038502.pdf
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f39dd52e11---4310427563.pdf
    • http://xn--12cbg9dihj7egda2g6a7dceb1d2cp4nvgf4f.com/datas/files/xoronivem.pdf
    • https://sport-jicin.cz/dokumenty/nowavogaxuxuvi.pdf
    • https://lecachet.fr/docs/files/kuvimovejexozojezuwepa.pdf
    • https://easypayindia.in/userfiles/file/wuzazigake.pdf
    • http://sangiorgioautoservizi.com/userfiles/files/pazit.pdf
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8c6a03d08---bilifanetinokuvozapeximux.pdf
    • https://mimpiindah168.com/contents/files/71062994252.pdf
    • https://marbletreasures.com/uploads/image/files/nagomimofev.pdf
    • https://fundacionamigosdelmarcaribe.ong/ckfinder/userfiles/files/8505530839.pdf
    • https://plantbiochem.com/ckfinder/userfiles/files/nadebikemizubufazitafubo.pdf
    • http://greensquares.in/userfiles/file///36507368399.pdf
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd88724c2e---59202847089.pdf
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161309d8f7c0ab---90873006857.pdf
    • https://www.servicespace.org/inc/ckfinder/userfiles/files/49474381773.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=boboiboy+power+spheres+game+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e402.bin
fd96a6bf66857ded7afa85b002b41dfcb88119da9e5e309269f6a56179894d1a
pdf-font-stream PDF embedded font (sfnt) at offset 0xE402 11132 bytes
font_01_sfnt_off0000fd6d.bin
9d2bb2d94384256bb38bab4c3005c13f44a8b25eb5b232dcefe64ad24aae4b51
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD6D 1868 bytes
font_02_sfnt_off00010624.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10624 16792 bytes
font_03_sfnt_off00011e36.bin
b2d5930e0dc9f7d00f508046a789a700f109baa21faead42820d91b69eb367fe
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E36 24932 bytes
font_04_sfnt_off00015edc.bin
071bac7a3a90310621307d68123817e30fba7c89f9e5021c4391eb43bd8b9137
pdf-font-stream PDF embedded font (sfnt) at offset 0x15EDC 16132 bytes