Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e2faa2477b33088…

MALICIOUS

PDF

112.3 KB Created: 2021-06-30 10:05:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 28dd2de8700ff807364c82942de6a373 SHA-1: 03cda34a77a6476dd39dc07f48b728c717e1da18 SHA-256: 3e2faa2477b330885810f661294982a9c3c8631c544025646ccad21509834bf8
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the primary attack vector appears to be the exploitation of user trust through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9931

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://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/6093b2aff6096bf3c00bda1246d0fd6e/zuriwunizob.pdf In PDF document text
    • http://tgtech-auto.com/userfiles/file/26397186974.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a565396dec2---13599947282.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/33982623039.pdfIn PDF document text
    • https://xn--fct8ml6mwue.tw/uploads/files/55750167927.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/9badebb0204c6ab4ae7e692389a486e4/10621024230.pdfIn PDF document text
    • http://suachuadienlanhhoaphat.com/hinhanh_fckeditor/file/26484584260.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c401260721---pimefugewisigiboburaxad.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160744f8ca19f8---livowuvifemi.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/pfgq2gbk6p8rlecgrseaobgav8/9318233171.pdfIn PDF document text
    • https://ebooksweb.net/files/file/wulojumivewuxurux.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb29ddbc5b---vezixukizovadisa.pdfIn PDF document text
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/voeppnfnn5fv3q26eebt1djk5v/8245748580.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b27bb1a894---66714683277.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b0db25645d---potoxomodezowikipeba.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/rosilewumepowitasa.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/6heqhqkvthtubg6bpukf2ie5qp/guxejomonegozakoj.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608c00a9d05b0---65526171440.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/a32ee71e5634408ef03faf0bb9d64fba/xelubutifajax.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/pqjf8f6o818udgstd7k60egkh7/95146539720.pdfIn PDF document text
    • http://galluccifaibano.it/userfiles/file/79870258012.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f39361076c---76174364878.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2a46555b55---valaxajafipaguroga.pdfIn PDF document text
    • http://dental-forum.ru/userfiles/file/mupasuleruvewaba.pdfIn PDF document text
    • http://cipetbhopal.com/webimg/files/53951209473.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=what+is+one+way+that+historians+can+establishPDF 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_off000154ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154EE 10660 bytes
SHA-256: 045d1536c92b62eac426c33f4107c2dd3d5450be3b780841890870a91b26ce8b
font_01_sfnt_off00016d66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D66 17144 bytes
SHA-256: 4fdb8b33c89ab22652048e42a261c76c3e6346add30b07ec02e5faf898bb6b05
font_02_sfnt_off000199dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x199DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1