Malicious PDF — malware analysis report

Static analysis result for SHA-256 c75d570cd40349fc…

MALICIOUS

PDF

87.1 KB Created: 2021-08-07 16:45:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 68fa2e2ef60f25acbab84e9e7254b7d8 SHA-1: 017e7d91f137e9fef54d6ec1f7496ee23aa960af SHA-256: c75d570cd40349fce1e35e6bc4120e9294d7e1608142dc98ec8eaf446d83835d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress sites hosting PDF files. While no scripts were explicitly extracted, the nature of PDF link farms often involves JavaScript to redirect users, suggesting an attempt to lure victims to malicious sites for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f81739b83e4---gufedakup.pdf In PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/76cad7185e3aafa9ff3226766dc6434a/kabetibinapis.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/aa3f768c1b1ff7f17537b7d6738a7f14/94112057971.pdfIn PDF document text
    • http://24horasnoar.com.br/ckfinder/userfiles/files/todimogonokadiwijavix.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/eeefd1842cf315ffeece664c96d2e2cb/24531374044.pdfIn PDF document text
    • http://kirakuramenandsushi.com/uploads/files/89940703969.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608abff1687eb---wilokumuziraleb.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2b1bdb178---49934192061.pdfIn PDF document text
    • http://insfilings.com/skyzone_classic/upload/files/vitovujefixuliwimu.pdfIn PDF document text
    • https://gyn-koe70.de/obrazky/file/lugav.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16080906b966fe---94618784473.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/nhbhigt2osgm1en2akik66nddf/18179601044.pdfIn PDF document text
    • http://proxima-online.it/public/file/48376542208.pdfIn PDF document text
    • http://deltools.com/userfiles/file/gomuzabokup.pdfIn PDF document text
    • http://maxtarget.by/ckfinder/userfiles/files/kafetudanititewizilurono.pdfIn PDF document text
    • http://filatelianumismaticaumbra.it/userfiles/file/gupigawirevotafajutedaz.pdfIn PDF document text
    • http://normel.org/files/upload/file/47869211984.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/8p7a2ftspcupja8rq7hda0flma/gagef.pdfIn PDF document text
    • http://alumcity.ru/userfiles/file/24923521023.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/027736a3f0546ae9549bc69d7feb1f2a/pekiwalenoga.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bf205fd3f0a---12719277540.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/777ee6deabea1d303f035d9754f4d0da/30938798070.pdfIn PDF document text
    • http://englandmatchshirts.com/assets/file/44554709998.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/zujuzurenota.pdfIn PDF document text
    • http://sacmacbook.net/userfiles/file/22787300788.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=ccnp+routing+and+switching+foundation+learning+guide+libraryPDF 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_off0000f0cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CB 11372 bytes
SHA-256: 6129fed6401d07208a2c5dd754d2c9b96a314ac4286be1a539bbfea277eab46f
font_01_sfnt_off00010b28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001233a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1233A 16340 bytes
SHA-256: 67d2c3bce32323ed4113bab3bb93cdee319c2c9cd297f881678a42c6f090b1ef