Malicious PDF — malware analysis report

Static analysis result for SHA-256 939dd25ee6b1c2b9…

MALICIOUS

PDF

73.1 KB Created: 2021-09-19 08:30:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e457b9799a834dad34fc7819e8cb3242 SHA-1: ffa5c2a31e63354c882c3f19dd377e85bddcdb9e SHA-256: 939dd25ee6b1c2b9ccd6d25f6fa50d70636704cbc8501bb9cd79c13888ba690c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to various domains, many of which appear to be compromised or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, preventing a more detailed analysis of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/09e81b149a9830ef2b809269bbc1fc61/84955918474.pdf In PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613e64894f794---lugubuxixowabimilidid.pdfIn PDF document text
    • http://iamsong.vn/uploads/files/15641877838.pdfIn PDF document text
    • http://vlajamo.cz/images/file/37221489040.pdfIn PDF document text
    • http://xn--80aer5aza.xn--19-kmcm3c.xn--p1ai/ckfinder/userfiles/files/jelafu.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/6e74a83b20370494a1d7129189fe5834/32772670307.pdfIn PDF document text
    • https://vanchuyenduongsat.vn/upload/files/rifovugurosibeba.pdfIn PDF document text
    • http://sevennews.com.br/ckfinder/userfiles/files/sabifukup.pdfIn PDF document text
    • http://deurenhanger.nl/userfiles/file/69218861185.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16140251f9bd28---laperuxakakulaxofivijaxe.pdfIn PDF document text
    • http://www.smartusb.info/images/library/File/momelima.pdfIn PDF document text
    • http://kdekdyjak.cz/data/2073616284.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/73051342485.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/56106500190.pdfIn PDF document text
    • https://jechrina.gr/FCKeditor/userimages/file/xepasupubexezidokivud.pdfIn PDF document text
    • https://mitrasuksesku.com/userfiles/file/73684107894.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613f8af0acea7---74730938506.pdfIn PDF document text
    • http://maturitni-ples.eu/UserFiles/File/timuvapaxuvakuzabaped.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/kedejorunirokemovino.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b43f94f373c6955b3ac94cebd4757370/60192983402.pdfIn PDF document text
    • http://sobateracota.ro/mm/file/45486825190.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/0ad6eff5f961d7886b1f7b99f6ad756d/pugiwoxolarumapanejel.pdfIn PDF document text
    • https://ismet.com.br/ckfinder/userfiles/files/toxulazibira.pdfIn PDF document text
    • http://synergytaekwondo.com/click2buy_newp/userfiles/file/73035280800.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=wwe+2k18+ppsspp+filePDF 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_off0000bc53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC53 17088 bytes
SHA-256: ad0e8fe4417a0af175082313096f37bdd0dfec83739516d927e296e543c0b098
font_01_sfnt_off0000e790.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE790 10320 bytes
SHA-256: f75c4677eec180a1ab6cc313160090d46b405d1e8b602b03c40b4999e835df90
font_02_sfnt_off0000ff18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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