Malicious PDF — malware analysis report

Static analysis result for SHA-256 f438279d2641d101…

MALICIOUS

PDF

89.7 KB Created: 2021-07-27 21:42:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7806693df07b5b4c05b8227011d0b3d6 SHA-1: 3951d3ac2550d035660b7c99a40291a664bbaf55 SHA-256: f438279d2641d1017a4c3095809a6af61bbae2994fb6110f49a0af6a4fa2d900
176 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to distribute malware. The presence of a raw IP address in one of the URIs further increases suspicion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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
  • 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.
  • 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://grandplaza.bg/uploads/assets/file/12407210034.pdf In PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/9391a550168476ab41dccd7acfa78975/disanofinusovezizevebofi.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/g7pakps95hbugq93ep86341ks9/78292933971.pdfIn PDF document text
    • https://resonanceacteurs.nl/userfiles/file/fulefawomi.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2bf11f9b6---51067183706.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/sofobowafix.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/23245926873.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/10664017038.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/88052814443.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/skjgsuuhhqqf5r21r589eltnks/wigovepexujinorarodoze.pdfIn PDF document text
    • http://140.121.180.103/ckfinder/userfiles/files/8102307476.pdfPDF link annotation
    • https://west-holding.com/userfiles/file/madomuvijojumitusebipom.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160d482c5e8587---dopajabomixabevofawugike.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160722fd554b85---raxip.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6287a15aac---wipobapadatogo.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160802d88ae6e6---67743329160.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160a4bd7f63dbd---16506311872.pdfIn PDF document text
    • http://edu-tur.ru/userfiles/file/52600870758.pdfIn PDF document text
    • http://fluitec.fr/ressource/site-image/files/bigomeviwuto.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/3edff63a7e8ce25a57c34272eabb4f65/molijugetuvonafibip.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/86975056758.pdfIn PDF document text
    • http://yasaitogo.com/uploads/files/sijukalodabebekije.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/5eab067dd47f69d5b6673e824fec5f64/situkamenodovu.pdfIn PDF document text
    • http://mariangelesorrico.com/galeria/files/24882856591.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=synaptics+touchpad+driver+windows+7PDF 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_off0000f88e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88E 17296 bytes
SHA-256: 64dc464c40960ce863fcee323260b86a06ca62bda0263caf446535ac88675d8f
font_01_sfnt_off000125fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013e12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E12 11056 bytes
SHA-256: 56eaf501b3b8cd203b09316bffc6e8f66dc9fd8ca7df6e5931128ca1659ce6d4

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