Malicious PDF — malware analysis report

Static analysis result for SHA-256 c708b16218cc268a…

MALICIOUS

PDF

72.7 KB Created: 2021-09-26 03:09:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 217ee730491d32e4eb840dd722f74f41 SHA-1: 23a3337404971fe55600d05a97158422feb931b1 SHA-256: c708b16218cc268af08f56676a4cf88c5d4a419b1de4f33ee605ecda27b95765
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to multiple disposable hosting sites, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous unknown URLs suggests these are likely C2 or payload delivery endpoints.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://sculecuacumulator.ro/app/webroot/files/userfiles/files/gajizoxinesogus.pdf In PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/28fd87cf94bd6b9ee19ded8a4f491f47/tezukakijiwaxisanejovus.pdfIn PDF document text
    • https://eurouniversal.eu/ckfinder/userfiles/files/labifexabajedan.pdfIn PDF document text
    • http://www.vegagastro.pl/upload/file/88621377974.pdfIn PDF document text
    • http://bamor.org/userfiles/file/29884572395.pdfIn PDF document text
    • http://perlawarmii.pl/userfiles/file/77461202943.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144ac7c780f9---47720950607.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/54753233359.pdfIn PDF document text
    • http://jungvassar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/worubuj.pdfIn PDF document text
    • http://ekachaiguitarist.com/ckfinder/userfiles/files/sexijajarujasopa.pdfIn PDF document text
    • http://canadianartistic.com/userfiles/file/56173342735.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/54068960795.pdfIn PDF document text
    • http://e-restauracion.com/app/webroot/files/uploads/files/gaxadumek.pdfIn PDF document text
    • https://abctranslink.com/ckfinder/userfiles/files/zikovonosudirizokolo.pdfIn PDF document text
    • http://chanakol.com/ckfinder/userfiles/files/77787638712.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/d845855fb725ff47bc7e7ba52307abe1/sopixikuru.pdfIn PDF document text
    • https://esprimagroup.com/userfiles/file/78837069805.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613859e17a854---sosoxelumifupebeg.pdfIn PDF document text
    • http://skomi.ru/img/files/file/limasikafazesigusatazito.pdfIn PDF document text
    • https://chaletsuenodesol.de/files/pifixoro.pdfIn PDF document text
    • http://isotech.si/uporabnik/file/40307651697.pdfIn PDF document text
    • http://kocavietnam.com/upload/files/6765786266.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=disable+screen+capture+androidPDF 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_off0000b507.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB507 10748 bytes
SHA-256: 3c5fc7549e5390d0b460ff9d150e7d1b70f5091e6886120a9240c241b329cba7
font_01_sfnt_off0000cd9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD9B 18480 bytes
SHA-256: ec836a94ba4a5935cb4c5a153aba78f621a49c846c64f819c87fe2a937c88ca0
font_02_sfnt_off0000fd24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1