Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2f33a9d32112440…

MALICIOUS

PDF

82.4 KB Created: 2021-06-27 07:42:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 46ff4f0a606f77ce9979418f947e7a8a SHA-1: 2b2d58ddddc7ff878121b6ec66ffc6aedb471442 SHA-256: e2f33a9d32112440fceae476da020a0dccf8639dfbcab39d3e4e9009a0eddcdf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised WordPress sites, indicating it functions as a link farm to distribute further malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the nature of the link farm and the presence of embedded URLs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://mai-colle.jp/userfiles/file/tumediragejod.pdf
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/06175a6a810763739b304538660c7c4f/42530867559.pdf
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/9771c55ddc933492ccff8dda838cfe0a/96177779642.pdf
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/9kr36h8pcsl4bril2qjf7tqok5/21779757853.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c860e074a81---52599482294.pdf
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/fd86062328a463d62cd7441759236309/64474165891.pdf
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/ec5c118bda873287129f0ee2a741c1ce/37755598071.pdf
    • http://teusz.pl/UserFiles/file/80969205472.pdf
    • http://beautifulmoda.com/userfiles/files/30538891300.pdf
    • http://handsonmontessoripk.com/userfiles/files/39729941464.pdf
    • http://amdind.com/userfiles/file/fivaterawopopomibu.pdf
    • http://astro2sphere.com/admin/images/file/feriweposo.pdf
    • http://ibb-online.ru/f/file/surutap.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/6b0654ahkq0le1gjlh1c9l3mu0/rosufafolefemewupod.pdf
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/e9fd4b83a9a73bf006f88708df404698/naduzapevowobenudole.pdf
    • http://bartuceviri.com/userfiles/file/nexedit.pdf
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070ed4855205---34308047079.pdf
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6c1d88ca3---xapisimirafo.pdf
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090a48db6ade---43199255078.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=piano+notes+for+coffin+dance
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da87.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA87 16792 bytes
font_01_sfnt_off0000f29e.bin
22a52442601f14eaa86c7bcfebe0acbcb0d791dc200332a6d0e013ef16a10487
pdf-font-stream PDF embedded font (sfnt) at offset 0xF29E 10424 bytes
font_02_sfnt_off00010a64.bin
99230ebe40ad830218238dd1de7413838a5c4d0886413294e18175dc52c8735f
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A64 19436 bytes