Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1ac682f1b0647c5…

MALICIOUS

PDF

68.2 KB Created: 2021-10-01 02:32:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0c0c481190da5ae89b70708fde5a8f7b SHA-1: 52966f2fad1e23588a7f5d68d8ca471bca0d8060 SHA-256: b1ac682f1b0647c57cd0e69c92bd9b94d196210a8b301a00573e2a4b45418e27
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, containing numerous URLs that point to external sites, some of which are hosted on compromised CMS upload directories. This suggests an attempt to lure users to malicious or compromised content, likely for phishing or further malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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 http://misr-consult.com/userfiles/file/sarujukusinaketifix.pdf In PDF document text
    • https://www.hotel-restaurant-plainfaing.fr/ckfinder/userfiles/files/zowipafigasofadifutekowu.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/povovekigukitomazimakima.pdfIn PDF document text
    • http://rickgrisolia.com/userfiles/files/nokesisefap.pdfIn PDF document text
    • https://sergiomauri.com/images/file/lapafuvixup.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16135d1b1145bd---bazunato.pdfIn PDF document text
    • http://polimak.pl/userfiles/file/tiworudewifibozerutoje.pdfIn PDF document text
    • https://www.hkha.org/ckfinder/userfiles/files/xugopigipexoda.pdfIn PDF document text
    • http://g-shocktou.com/user_file/file/12201457556.pdfIn PDF document text
    • https://sierrainstruments.cn/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/zimemidujowinonowa.pdfIn PDF document text
    • http://www.ufolep-69.com/contenus/files/weziranurij.pdfIn PDF document text
    • http://biosite.ru/images/news/file/39522834207.pdfIn PDF document text
    • https://spcinternational.in/ckfinder/userfiles/files/javoxilodenajasinudobej.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/57195651359.pdfIn PDF document text
    • http://suvagcentr.ru/userfiles/files/85792988743.pdfIn PDF document text
    • http://nextgenship.net/upload/file/2021091016312988966.pdfIn PDF document text
    • http://allineers.morefriendship.com/upload/files/54840737025.pdfIn PDF document text
    • http://mijinmotor.com/fckeditor/userfiles/file/golabarevuraxepoxep.pdfIn PDF document text
    • https://madhubanindiancuisine.com/nbloom/fckuploads/file/pevuvifiverajaroteto.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/161352c438777c---25651061866.pdfIn PDF document text
    • http://cicm2015.mist.ac.bd/app/webroot/ckfinder/userfiles/files/zudopotes.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/eba056732b8da433a89ce0cf8be2fcd6/43881162438.pdfIn PDF document text
    • http://www.solarwindependence.com/ckfinder/userfiles/files/86130085615.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=youcut+video+editingPDF 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_off0000afc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFC5 14852 bytes
SHA-256: 94374da3a22614b9e163f4fb8eca6847e477340636eba9daf9182b5729cfc2f8
font_01_sfnt_off0000d4af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ecc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC6 10216 bytes
SHA-256: 6266b75c35cf35fdb560b40b2df8e5a0ea2f7be9aeb82aa976cb9671de4ec024

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