Malicious PDF — malware analysis report

Static analysis result for SHA-256 90d8fc257d6cd997…

MALICIOUS

PDF

70.4 KB Created: 2021-09-28 22:09:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: aea626768d0453b6750e977f0fa3b76c SHA-1: 118002e38497735d33bf61cfeb6dbe3b8f63c3d7 SHA-256: 90d8fc257d6cd99764686b638917ffbf03894868e723271fd1879f7857706d4a
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm or phishing lure. The presence of 'utm_term=android+pdf+download+location' in one URL indicates a potential attempt to trick users into downloading malicious files disguised as legitimate software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://catamma.ru/uplcv?utm_term=android+pdf+download+location PDF link annotation
    • http://jvmont.eu/userfiles/file/fijurawaruxe.pdfIn PDF document text
    • http://oldmotorsclub.com/files/file/58231058519.pdfIn PDF document text
    • http://amsasecretariat.fr/userfiles/file/16943977524.pdfIn PDF document text
    • http://xn--80akoseq9f.xn--p1ai/userfiles/file/falurito.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/nobenosegudi.pdfIn PDF document text
    • https://latgalesamatnieki.lv/files/file/nibujajel.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1614089ca37a2c---kajeverafijosefogupixotek.pdfIn PDF document text
    • http://abwingstop.com/uploads/files/83352277806.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/161387036269bf---ginejetapigoge.pdfIn PDF document text
    • http://sparkpro.lv/content/file/71357908924.pdfIn PDF document text
    • http://hotelbellevuepalermo.com/userfiles/files/9669764342.pdfIn PDF document text
    • http://filipdegreef.be/uploads/files/muwipugogevelugekusupe.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///91396190389.pdfIn PDF document text
    • http://www.colormotion.cz/UserFiles/file/43307975652.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143c26fa2c29---88255721122.pdfIn PDF document text
    • http://volamthienha.top/userfiles/file/zalaloleramijezolo.pdfIn PDF document text
    • http://azstorestudio.com/uploads/files/19315672798.pdfIn PDF document text
    • https://2ruoteexpo.it/ckfinder/userfiles/files/xeduripojopemaxerolobe.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/856bc216c79eb95d163a9f19b1c45520/66946480789.pdfIn PDF document text
    • https://laplacedesstores.com/upload/file/tupajamefavonezixatozuka.pdfIn PDF document text
    • http://eltprof.ru/userfiles/file/60551791189.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000aec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEC0 14740 bytes
SHA-256: e800d492e730caf9385d31f037775343a00ccf02f9d3e3f065674fbc791d0c8c
font_01_sfnt_off0000d347.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD347 1860 bytes
SHA-256: 562d39cc93351683f3420870a5578826c1285db13c691c08f99be18f4980e560
font_02_sfnt_off0000dbfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0000f414.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF414 10380 bytes
SHA-256: afe10a122dce2350ce846456eb40a2d68148a7122c47da6eec54f3a5731cc974

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