Malicious PDF — malware analysis report

Static analysis result for SHA-256 6681022f4a9ca4ec…

MALICIOUS

PDF

99.3 KB Created: 2021-08-12 21:19:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 76a2647b0e97561a02510aefea206780 SHA-1: 4c251e9df63132833faa29c3444563cf99416b6f SHA-256: 6681022f4a9ca4ec7c0dd576020b8d19ae79d4a8f7ec4b4debdcd48231f54d68
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the PDF structure itself are indicative of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://topup-fight.com/ckfinder/userfiles/files/zekiwapoxebavipida.pdf In PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a264d0753db---20244984219.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084598e42cb1---kepilumusalisogamul.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/c0ccdd078b2144fd79630f15ceacc02c/38470234366.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1610374e96fd03---ralititoxeg.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/dc071a3d3499b50b36916abd7f881d40/64252980734.pdfIn PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/d301b06cb341f992328dffd5c66a4aed/gofenizuje.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/4b0f48dadaf3c17f3d37293ee1f45f2a/zabaxizos.pdfIn PDF document text
    • https://cottingham-group.com/cufiles/files/pufokemepalime.pdfIn PDF document text
    • http://chinoboxingclub.com/clients/36032/File/mivarisumuteju.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c89b8c5c058---jexoximumenemajevera.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16106ee9abe301---74632816361.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/cc397d909c602002623359322f4ce475/35619373185.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/pozesijowo.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec9c55eaff---3047825961.pdfIn PDF document text
    • http://reklama-v-sochi.com/ckfinder/userfiles/files/79217310314.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/g6obujpsjjd81el1qo2gqqbcll/pedafumukilejivirakekes.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/tiviba.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/b31bgml8ifqrdvk0isbdj0dk8c/58777561492.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/63599288154.pdfIn PDF document text
    • https://bangvetthuong.com/luutru/files/4501189077.pdfIn PDF document text
    • http://xlsferrosilicon.com/d/files/7107644063.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/41113431330.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/zasofarosedamud.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/2ad890dfe2a5b4e4f84e3361212fc553/dizumokomukolis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=what+is+the+main+theme+of+sonnet+18PDF 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_off00012052.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12052 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013869.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13869 10584 bytes
SHA-256: 20eca4240137d7ee8763e2d626e959fe54b03df93557c45dc6fb1cbc2dfd16ef
font_02_sfnt_off00015077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15077 17096 bytes
SHA-256: 34ef5166f72c3d822511e9104977b7c01f724bd9396ae540a04e8dfdba2cc1d3