Malicious PDF — malware analysis report

Static analysis result for SHA-256 0552c1c00d735a65…

MALICIOUS

PDF

81.2 KB Created: 2021-10-11 06:55:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 0cd020ae1f4c262d1476e8d845f36505 SHA-1: e5d84d2c6cd5a076d2d3be403f802a43280bad8f SHA-256: 0552c1c00d735a6543bd1e3eacee81445375790428fd73d2ab39c2f2727b421d
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, including one pointing to a raw IP address, suggesting it's designed to redirect users to potentially harmful content. The presence of compromised CMS upload links and link farms on disposable hosting further indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 http://teplolux72.ru/upload/file/fumorukaruloxaduxusuz.pdf In PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-9-16/20210916085939261708.pdfIn PDF document text
    • http://indyztyle.com/ckfinder/userfiles/files/22527404074.pdfIn PDF document text
    • https://megacook.pt/site/upload/file/gizebinujepojad.pdfIn PDF document text
    • https://travelone.ae/userfiles/files/14860415955.pdfIn PDF document text
    • http://faurau.com/luodan/images/userfiles/file/91567845093.pdfIn PDF document text
    • https://bepcongnghiepphuchung.vn/userfiles/file/mewurarorunelezurawatu.pdfIn PDF document text
    • http://es-iyashinomori.net/yamituki-n/uploads/files/10221829066.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ef1047ad1a---naneguxogibetu.pdfIn PDF document text
    • http://technology-mp.it/userfiles/files/55912568331.pdfIn PDF document text
    • http://bociany.sk/media/file/senurekalukolezalutogaw.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615381fde2f15---wurafoxejobu.pdfIn PDF document text
    • http://slbreakingnews.com/ckfinder/userfiles/files/60168054324.pdfIn PDF document text
    • http://innova-perila.ru/upload/files/1656719376.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1614f4b041afaa---jomuvarosazogusova.pdfPDF link annotation
    • https://sassanoproperties.com/FCKeditor/file/20967823201.pdfIn PDF document text
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/betigatenerepugiwoxujomib.pdfIn PDF document text
    • http://ingpoggi.eu/userfiles/files/zipanadesasexe.pdfIn PDF document text
    • https://materiale-parchet.ro/fisiere/file/nozefekazeviwifuxutifuxos.pdfIn PDF document text
    • https://iveducentar.com/uploads/assets/file/64516270172.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/92910240397.pdfIn PDF document text
    • http://titibbs.xyz/js/ckfinder/userfiles/files/33630166256.pdfIn PDF document text
    • http://francescasciortino.it/userfiles/files/seredolamipawili.pdfIn PDF document text
    • http://joyearland.com/ckfinder/userfiles/files/pexoxevapif.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614185e563d6d---95123707906.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=what+does+dt+mean+in+textPDF 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_off0000d708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD708 18756 bytes
SHA-256: 6f5edaa7397a740a9eeb0b9e4eadd1e57105f82eb6698a6ae479655a77d1c529
font_01_sfnt_off00010749.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10749 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F60 10464 bytes
SHA-256: 6dc2d43add2ad6779478e20881201d0f39c395058c42aeccef18804ac448009d

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