Malicious PDF — malware analysis report

Static analysis result for SHA-256 2862e191019b441c…

MALICIOUS

PDF

97.9 KB Created: 2021-06-29 15:28:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 13ca5520509ff31f27a317d32d85fdf8 SHA-1: 3303301fb06c947e59f541c984b6c499f0aaea64 SHA-256: 2862e191019b441c750972db2d2a276609b223406dd595347b6efe63118e8073
156 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs pointing to various websites, including those hosted on compromised WordPress installations. The presence of these links suggests an attempt to direct users to potentially malicious content or phishing sites, aligning with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://digemnd.com/UserFiles/file/77147750961.pdf In PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c63bad51bb1---64527173887.pdfIn PDF document text
    • http://computerdoki.hu/user/file/42113053297.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/sexeluva.pdfIn PDF document text
    • https://landbar.com/upload/files/sobikonalejawozi.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/p0lmt5n5tiadslm942ukjbfk17/xenom.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16082d4d7158a0---denadedetuxixirumez.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/82e97617b2bba19fbe93924b43fa7706/56862572341.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/nks49985gktnmu59mcuumqviel/45821119572.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/dutogisavosaweka.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160706c196e253---rimukupib.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4e936a27a---mexaneturemolifowe.pdfIn PDF document text
    • http://maybomnuocdanang.com/uploads/image/files/nededojam.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/04f8f4e0eb1cb75d806c2faa04c2941d/78390960587.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/vonobarenuvu.pdfIn PDF document text
    • http://stagnesreunion.com/clients/e/ed/ed16748122b3ff8ec97113314e0446c4/File/niliz.pdfIn PDF document text
    • http://csc-0898.com/userfiles/file/20210626152940_xpsver.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/74600d627e73d1d911c34e1a3eb41b8b/muwilobo.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/800c24f6b694d64cc51b1244972f7d5f/65933570229.pdfIn PDF document text
    • http://moscow-vernisage.com/files/files/nugutuz.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160812b5527202---garezamumisikuvosirezow.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/ae67dd23af0ee15e03f41f53cb957def/ferutikinasujorikerozesat.pdfIn PDF document text
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160771ddf5ab47---4121011991.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a984f2e716c---xezugesim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=weber%27s+sociological+theoryPDF 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_off00011f00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F00 10684 bytes
SHA-256: 96ec9c55bcaa35314037db889b236c19091722615ada66a58ff5e44876d8695c
font_01_sfnt_off000137c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014fd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FD8 16460 bytes
SHA-256: 3571dad1d2338c6bcd0842c145c858026adac169d4d38663ddb3b6d0303ae274