Malicious PDF — malware analysis report

Static analysis result for SHA-256 64461b12c5b45cea…

MALICIOUS

PDF

93.8 KB Created: 2021-10-07 07:33:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 38cdb1df5c8fb91ab940aa47747e12aa SHA-1: c047808eec33906eb51a7ece191da6732a326d1c SHA-256: 64461b12c5b45cea05965f13c8499f754e5bf38a2b284bddcff2f00486708447
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The presence of embedded JavaScript and numerous external links, including those hosted on compromised CMS upload storage, strongly suggests a malicious intent. The ML classifier and ClamAV detection further corroborate this, indicating the PDF is likely a phishing or malware distribution vehicle. The embedded JavaScript is likely used to facilitate the download or redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://inwebjor.ru/uplcv?utm_term=5+star+interview+questions+and+answers PDF link annotation
    • https://jdsliquorlocker.com/nbloom/fckuploads/file/65849963820.pdfIn PDF document text
    • http://mindatpeace.us/uploads/files/98144267930.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/fujobize.pdfIn PDF document text
    • http://athaj2.specialty-match.com/upload/files/vevomejir.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16141f3081ae7c---41497020420.pdfIn PDF document text
    • http://thesnowmanicecream.com/ckfinder/userfiles/files/botowizijepuwifopajixosu.pdfIn PDF document text
    • http://viswinkelindex.nl/images/uploads/36843843852.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/35100104244.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16157fae5e797c---joridugira.pdfIn PDF document text
    • http://seatraderhk.com/userfiles/1070492258.pdfIn PDF document text
    • http://brukikostka.pl/uploads/page/file/nujivodoxaf.pdfIn PDF document text
    • http://rvhifi.cz/files/file/digeruzopamukanidarowine.pdfIn PDF document text
    • http://canavesiobruno-architetti.it/userfiles/files/3647327625.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/85490299721.pdfIn PDF document text
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/patirilaseri.pdfIn PDF document text
    • https://www.singaporemedicalclinic.com/ckfinder/userfiles/files/ludiwebepijeze.pdfIn PDF document text
    • https://signos.larrialdiak.es/files/galeria/files/61818836170.pdfIn PDF document text
    • https://www.fibertech1.com/my_content/js/ckfinder/userfiles/files/99382586922.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1615318551888e---pukaw.pdfIn PDF document text
    • https://alistairmills.com/ckfinder/userfiles/files/61251494613.pdfIn PDF document text
    • https://jeevandeepspecialcare.com/ckeditor/ckfinder/userfiles/files/78342056146.pdfIn PDF document text
    • http://jiji.pgo.tw/pic/uploads/files/60369338518.pdfIn PDF document text
    • https://bepxuyenviet.com/upload/files/zexeselunul.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16150fcbba944c---30496573882.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_off00010984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10984 10632 bytes
SHA-256: 714385c5736b1372e0c83b100ba691fec0ecd69299838dd148780ec3aa71c401
font_01_sfnt_off000121d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121D2 18148 bytes
SHA-256: 18f2b312b7b2e30c444676b9a19510329f73854a10f612736effc29d1e0871df
font_02_sfnt_off0001511e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1511E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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