Malicious PDF — malware analysis report

Static analysis result for SHA-256 db0aa6f74fd02079…

MALICIOUS

PDF

84.5 KB Created: 2021-09-23 12:31:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 159de9e499f4ae4cad4d586d25a7d2b2 SHA-1: 18919ec853aa25deced0954335b02c586b41595b SHA-256: db0aa6f74fd0207950397490065129c3075a276208fa7564c58e1bb0fa188560
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the heuristics point towards the document being used to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • 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.
  • 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://ketchas.ru/uplcv?utm_term=what+is+the+collective+noun+of+sticks PDF link annotation
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1614290d5aaae2---83332897502.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161468162b08ae---52013043808.pdfIn PDF document text
    • http://drprdesaihospital.com/uploads/parubujiziwixeraw.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/2cd1d67f59d2485e6829784274ef5f30/bipawedelanosaji.pdfIn PDF document text
    • https://fotografski-studio.kost.si/userfiles/file/30377278505.pdfIn PDF document text
    • http://inbeeldt.nl/userfiles/file/potozitaruzefifikawan.pdfIn PDF document text
    • https://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/71536801471.pdfIn PDF document text
    • https://afayl.com/userfiles/file/wokasemudebado.pdfIn PDF document text
    • http://yugreat.com/filespath/files/20210922202639.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b3ba961cec---manuw.pdfIn PDF document text
    • https://alienaquatics.com/home/gb/public_html/ckfinder/userfiles/files/mimuxulawubidofav.pdfIn PDF document text
    • https://monamifrance.com/FileData/ckfinder/files/20210908_17917D188F860539.pdfIn PDF document text
    • https://mavibusiness.it/file/lejil.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/pmlcbuo8iku874huhtc5g3sgp1/butixifumulepokoguka.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/pitolejilorem.pdfIn PDF document text
    • http://odnoklassniki-files.ru/images/uploads/files/99375126929.pdfIn PDF document text
    • https://csn-alliance.com/data/files/mejoxapijaku.pdfIn PDF document text
    • http://asfalon.com/__files/file/24791449912.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140ccce68232---61240153390.pdfIn PDF document text
    • http://themadthinker.com/temp/vinney/HTML/userfiles/file/tuzadipabunuzatefo.pdfIn PDF document text
    • http://esrafisek.com/images_upload/files/keniwifulaxa.pdfIn PDF document text
    • http://makeyourpartnermelt.com/userfiles/file/3840844854.pdfIn PDF document text
    • http://eminenceinc.com/userfiles/file/zemitugafatas.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5391d28ba---12890089322.pdfIn PDF document text
    • http://chayka-svg.ru/files/sezakapagafakagopin.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/72663236462.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_off0000de29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f63b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF63B 20300 bytes
SHA-256: 3a475f24ac21e021abc100c22b2ff4804e99b427be06407ac1c2361fa43a1fc0
font_02_sfnt_off00012b9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B9A 10584 bytes
SHA-256: 6677588bb75c825a89a67da9f3eaf3017314cd6830b9f22abc2e3ead0fb9346b

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