Malicious PDF — malware analysis report

Static analysis result for SHA-256 3368c66117e87483…

MALICIOUS

PDF

82.2 KB Created: 2021-09-17 11:27:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b746b5e9e365e07bdb692eb41ad085ce SHA-1: 79d3b3bda465481ce6f232331c482c210bd34a51 SHA-256: 3368c66117e87483162797b1126b7fd7a2403a0e5a3e53187953c1ab0dac141d
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the PDF structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 https://huntic.ru/uplcv?utm_term=free+source+code+android+studio+music+player+offline PDF link annotation
    • https://gimenezricarte-deltabogados.com/ckfinder/userfiles/files/zogewolamum.pdfIn PDF document text
    • http://www.oiseaubleu-promo.fr/userfiles/file/wimeruzanumidusesabo.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131c93f8d8ca---rebiwuvijisedufan.pdfIn PDF document text
    • https://pindimana.in/uploads/file/gifodesad.pdfIn PDF document text
    • https://castilloexterior.net/ckfinder/userfiles/files/lafimakevurigobisutujibat.pdfIn PDF document text
    • https://tommytest.dish1314.com/data/html_editor/files/kugavi.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/89943345610.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613beeb192df5---51504835879.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-9-6/20210906111447392120.pdfIn PDF document text
    • http://kledingindex.nl/images/uploads/58785346626.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///tokololesipojal.pdfIn PDF document text
    • https://jasz-pap.hu/UserFiles/file/rixejimurilelolav.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/8fbef88f9fab487c826fe6d0a74d1801/26314697007.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1613f79680995b---85832535483.pdfIn PDF document text
    • http://gjbbang.com/userData/board/file/590055172.pdfIn PDF document text
    • http://plantessentialoil.com/upload/files/90169754110.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/161426b5518b62---9269323975.pdfIn PDF document text
    • http://www.mustwalge.ee/data/content/files/52949827453.pdfIn PDF document text
    • https://almudenafernandez.co/ckfinder/userfiles/Files/fibazixewavabixedezojemox.pdfIn PDF document text
    • https://dampinggame.com/calisma2/files/uploads/88779950055.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/wifujurated.pdfIn PDF document text
    • https://www.creativetalentnetwork.com/ckfinder/userfiles/files/19004308848.pdfIn PDF document text
    • http://laboratoriodiprogettazione-ve.it/userfiles/files/47205703979.pdfIn PDF document text
    • https://karatenarrewarren.com.au/ckfinder/userfiles/files/68447132842.pdfIn PDF document text
    • http://phubozena.pl/userfiles/file/xavezesuxolopivi.pdfIn PDF document text
    • http://thibangoto.com/app/webroot/uploads/files/94560809448.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_off0000d7dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7DD 18956 bytes
SHA-256: 10ea2d0f7aff6bad023e692d212af0fa94e3525da10d99d2c25f5e8ec3bbc218
font_01_sfnt_off00010924.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10924 10972 bytes
SHA-256: f37137711418a1287298993b0b6da81621a5ab3dc953a6de7b4d9bca04f9057a
font_02_sfnt_off0001229f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1229F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1