Malicious PDF — malware analysis report

Static analysis result for SHA-256 82ed06042d87d953…

MALICIOUS

PDF

93.1 KB Created: 2021-09-03 03:29:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b106c2c900b5381bf812c686596498ee SHA-1: d6e67f01efd5af6da2ff9c7f566eec41a527dae0 SHA-256: 82ed06042d87d953295c25dddc7ad72cfcea697a007494230e1f1350264dd5b0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV. It contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of external URIs and the overall structure indicate a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://medvor.ru/uplcv?utm_term=review+of+bilayer+tablets+pdf PDF link annotation
    • https://palet-school.com/files/files/13337922398.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf59e4b9ee---kidexew.pdfIn PDF document text
    • https://www.delaneyllc.com/ckfinder/userfiles/files/ribipalopasuxesekarali.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606feda782dac---59083205672.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16092eb92dc18c---93623817366.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/83859263d46370b89da5222232d4bcb3/zemusidovesutativovowena.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609c36892f13a---zuxabavefep.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088860f02857---zakaladelejosobamafiti.pdfIn PDF document text
    • https://tsegypt.com/file/pakuzupisixafalopiw.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a13c404f19f---gobar.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/4j3bvq33mpgthkqunpc5s1f8bo/favofavuwematowavemojiv.pdfIn PDF document text
    • http://architettoseneca.com/userfiles/files/mozuxidoxefod.pdfIn PDF document text
    • http://tomlitkom.ru/ckfinder/userfiles/files/68375220687.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a363f4eea0b---91418080464.pdfIn PDF document text
    • https://glaskunstcentrum.nl/images/file/29151633664.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/0be50a8ba94702ae97f1242e94b5db36/megedewitanesi.pdfIn PDF document text
    • http://saipanbooking.com/FileData/ckfinder/files/20210714_B8D185C61A3149D9.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/pewetugiju.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/vbcv7o7igptfoi6vq5qm0u7uhu/lorenupajujudesiputiwe.pdfIn PDF document text
    • http://compsult.net/userfiles/file/70298379995.pdfIn PDF document text
    • https://stayatrosetta.com/wp-content/plugins/super-forms/uploads/php/files/l1rkg08gh8hqgequtl80unk1g3/20846301253.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/d350595c9896a8d779a10e3ed1728a9d/20925152140.pdfIn PDF document text
    • https://exporoaster.com/app/webroot/files/images/pages/files/liratese.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_off000103af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011bc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC6 10840 bytes
SHA-256: 0a924b9c8c89db248872d593ffcfbace6b117909020e46823243a62466832e04
font_02_sfnt_off000134c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134C3 19092 bytes
SHA-256: 6246c0e9735f90e2a25e041568ca19c8409c969f94512bb4262c6490c89265a0

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