Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdb2ccc288a3a9b9…

MALICIOUS

PDF

85.9 KB Created: 2021-09-22 09:11:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e7f74ac137e191d70fa163bec2e903bc SHA-1: 28174f5709b68d91b6101b4d35e674fdbb646c1c SHA-256: cdb2ccc288a3a9b9794522734d2f67bdf36846e6e4a8f877b0b792bda386cfbe
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a large number of external links, many hosted on compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution scheme. The embedded JavaScript likely facilitates the download or execution of additional malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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=how+to+watch+web+series+free PDF link annotation
    • http://skulpt.in/admin/uploads/file/kukifapovune.pdfIn PDF document text
    • http://archidaldegan.eu/userfiles/files/78384621294.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613846f04ba2d---bitikevudef.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613da5a82521f---punamu.pdfIn PDF document text
    • http://sweepinstyle.com/userfiles/file/62361414911.pdfIn PDF document text
    • http://svatba-emi.com/uploads/pages/files/93964582296.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1614ac8f2dde20---fixarasebuzuwutebofelokas.pdfIn PDF document text
    • http://jujucuisine.com/userfiles/file/sobusotik.pdfIn PDF document text
    • http://knx-shop.ru/admin/ckfinder/userfiles/files/30027670064.pdfIn PDF document text
    • http://desiaussies.com/ckeditor/uploads/files/pexan.pdfIn PDF document text
    • http://simonkuehner.de/gfx/userfiles/files/50168941499.pdfIn PDF document text
    • http://bsinteriordesigner.com/userfiles/files/kowanovugob.pdfIn PDF document text
    • https://bk.knu.ac.kr/ckfinder/userfiles/files/mosipizofatunotito.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/tenesoxil.pdfIn PDF document text
    • https://theptaynam.vn/upload/files/89178477083.pdfIn PDF document text
    • http://hyundainhapkhau.net/upload/files/kexul.pdfIn PDF document text
    • http://cz-synergy.cz/data/file/48709148850.pdfIn PDF document text
    • http://www.afurg.com.br/assets/ckfinder/userfiles/files/41280855061.pdfIn PDF document text
    • https://safewatersolutions.in/ckfinder/userfiles/files/1624685448.pdfIn PDF document text
    • https://prestinieurope.com/userfiles/files/toful.pdfIn PDF document text
    • http://etepi.pt/js/ckfinder/userfiles/files/97194102154.pdfIn PDF document text
    • http://mousike.it/img_ins/files/pezibenajasirajefazitumov.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/76a2ecf8df8a6aec76b11298bfb095dd/kukanebofotan.pdfIn PDF document text
    • http://bloemenwinkelindex.nl/images/uploads/vafefarikuxixebatubo.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a151ccb476---8696354901.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/9843f4f75d5c663ed450071f13047579/wekadesatagizesakiwisi.pdfIn PDF document text
    • https://delaneyllc.cfonewsletter.com/ckfinder/userfiles/files/zamewiwegesuwawik.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_off0000eafa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFA 10500 bytes
SHA-256: 3bd013c83fa92b4845cf143e6ecc899ece8f0215ae260937edda34dac6f1535c
font_01_sfnt_off00010311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10311 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B23 18388 bytes
SHA-256: a943682fca93c6ae2a7f23e1e63395ce3d9279e5cee8c2e4b77ee28aa8253589

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