Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba4e40710ce399e8…

MALICIOUS

PDF

80.7 KB Created: 2021-09-20 01:09:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c843fb72273785c91095308827b3cea2 SHA-1: 86818ec3358cef576e2dda4fa70494b04b277a22 SHA-256: ba4e40710ce399e8aaef1ce3e1fdcd7dd7a51e38045d4f9021b3a32ba5f06303
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 compromised websites and disposable hosting, suggesting a link farm or phishing lure. The presence of external URIs and compromised CMS upload links further supports its role in directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://cructi.ru/uplcv?utm_term=custom+rom+android+7.0+download PDF link annotation
    • http://matraholding.hu/images/userfiles/files/51888412685.pdfIn PDF document text
    • https://bonvoyageindia.in/ckfinder/userfiles/files/soxenavopugazugimetafume.pdfIn PDF document text
    • https://xn--interpeas-r6a.es/upload/files/nifav.pdfIn PDF document text
    • http://www.peretprod.ro/content-images/file/tukewivesunewupedorigawo.pdfIn PDF document text
    • https://thaibamboorestaurant.ca/phpsites/bard_ford/uploads/file/winibi.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/vefisaridopi.pdfIn PDF document text
    • http://pro-customer.de/userfiles/file/37042283528.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/161409074c45b0---79905698371.pdfIn PDF document text
    • https://millersexpress.com/userfiles/file/5431374780.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612edefcad865---lababefebotepivi.pdfIn PDF document text
    • http://musicpark-live.com/userfiles/file/jaguwevopiwiwofaz.pdfIn PDF document text
    • https://hsdinstruments.nl/uploads/files/80671029369.pdfIn PDF document text
    • https://www.twibiotech.com/plugin/ce1/ckfinder/userfiles/files/89646775802.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/161351e222df4c---2928120703.pdfIn PDF document text
    • https://ev-owners.jp/userfiles/files/walor.pdfIn PDF document text
    • http://patronusalapitvany.hu/public_html/upload/nevatenoj.pdfIn PDF document text
    • http://annabarons.com/files/files/ribebisaxudalexineji.pdfIn PDF document text
    • http://portaldeaquidauana.com.br/ckfinder/userfiles/files/63942856933.pdfIn PDF document text
    • http://daltan.hu/userfiles/file/34049886728.pdfIn PDF document text
    • http://www.taimaobi.com/admin/ckfinder/userfiles/files/junewinerer.pdfIn PDF document text
    • https://bike-accessories.supersites.gr/content/ckfinder/files/5169661667.pdfIn PDF document text
    • http://sgo-bage.com/public/files/files/wefotakewagekedutovofi.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/mewatutixixepoxazujaj.pdfIn PDF document text
    • http://www.beautyvogue.ch/Files/file/vipex.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_off0000d5f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE03 17796 bytes
SHA-256: 60d39be32520f795a2eb82c689430e893e4ae85289d48c91279d9ff593807db3
font_02_sfnt_off00011c3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C3F 10732 bytes
SHA-256: 5f15666672ee671eb2fc34951f89eaae2be49365a752e4ba960c3c17b6122fdd

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