Malicious PDF — malware analysis report

Static analysis result for SHA-256 2673b5188731de73…

MALICIOUS

PDF

79.5 KB Created: 2021-09-06 04:56:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 379da2013dc16cb3ceed9e89ecfd759c SHA-1: 4b4a278960c245dce8fd2952a805235d09a2e508 SHA-256: 2673b5188731de73332809fec5cc88643fd79b03e30121368a809a6831150d7b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to potentially compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a common technique of using documents to host or link to malicious payloads.

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 http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a6ad784d2---7836015121.pdf In PDF document text
    • http://tunglamgarden.com/images/fck/file/bebavubanevati.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16091e6813857b---xifirotojomataxotagef.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/83641926166.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/161134b310bc8c---99472821086.pdfIn PDF document text
    • http://cs-golfclub.com/ckupload/files/lodomubifufepetuz.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611dc2f17a31e---47216022549.pdfIn PDF document text
    • http://unseretochter.com/images/file/83595564645.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/m79idv1g3vv11b0hol0kb2b74u/bolonezewonovatabogof.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/jifipeju.pdfIn PDF document text
    • http://dijladentalcenter-qa.com/userfiles/file/zazamolagiputomanovar.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/9612b2a280cde397123153233be0fd88/xetitasug.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e1e6f4c97ed---10226439881.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1609885e923963---44241581152.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/favunudifiwadigagib.pdfIn PDF document text
    • https://feniks9.ru/ckfinder/userfiles/files/soziral.pdfIn PDF document text
    • https://avgdesign.com/userfiles/file/45630691382.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160881fb039ab1---18971210097.pdfIn PDF document text
    • https://x-software.cz/data/file/63808843267.pdfIn PDF document text
    • http://webursitet.org/Files/file/57743815142.pdfIn PDF document text
    • http://dfwarbitrator.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/worojif.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608dac3195760---figofoxoxawe.pdfIn PDF document text
    • https://anitt.in/ckfinder/userfiles/files/subojezizokujureg.pdfIn PDF document text
    • http://www.weilandensemble.nl/ckfinder/userfiles/files/kegolenatagagusedajawixer.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/misahpbjhf2victftb83omivbg/533351281.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=agenda+2063+pdfPDF 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_off0000d1b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1B2 10612 bytes
SHA-256: 7d29753fe0674023ad9fc072d8bdeaf07ec896f6d3579335a739a232506feb2c
font_01_sfnt_off0000e9ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9EC 17896 bytes
SHA-256: 32c5650137e5f1307215e215dd09a4fe0e8df58a75cb78ba71872e231c5b3a2c
font_02_sfnt_off0001187b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1187B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1