Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bd943979f25880b…

MALICIOUS

PDF

90.6 KB Created: 2021-09-01 21:34:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b079fa488c0641aa9aa74977c34de757 SHA-1: 2e18cadb7cf21dbd79dd4082188412c2026e1c61 SHA-256: 5bd943979f25880b04b9299ad4eb0559c2404035a33a6b849a74d7b634f1bd9a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for executing malicious code. It also features a large number of external links, many pointing to compromised WordPress sites, indicating a likely phishing or link-farming operation. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9876

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://karapinarinsaat.net/userfiles/upload/file/gavitetem.pdf In PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/c818e6df7a11a5230e6b966c9c17e8a6/66345006325.pdfIn PDF document text
    • http://cortabellanews.com/userimages/fijusiwipekuvonilivovi.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/ivh5mocosdfhbv2k0afln4p974/13127188185.pdfIn PDF document text
    • http://www.artefuoricentro.it/js/lib/ckfinder/userfiles/files/54959059210.pdfIn PDF document text
    • https://tidaksusah.com/contents//files/65446718269.pdfIn PDF document text
    • http://www.biosafety.biz/ckfinder/userfiles/files/vulolomoge.pdfIn PDF document text
    • http://smartarts.bg/userfiles/file/41237423640.pdfIn PDF document text
    • http://alanaf.ru/userfiles/files/14005079346.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609b394c7cd65---10606870031.pdfIn PDF document text
    • http://bendhorseride.com/userfiles/file/6580746664.pdfIn PDF document text
    • http://waypl.pl/upload/File/balebulom.pdfIn PDF document text
    • http://chiesamadremarsala.eu/userfiles/files/ladevejudupix.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/9aqcpbvv4vps2lsfgccjgc8fed/batekipezi.pdfIn PDF document text
    • http://gardatrans.com/content/Files/towefudedopitima.pdfIn PDF document text
    • http://wmc21.com/ckupload/files/wazuzepewuz.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/acfg43ap8bdvbo0223u1rb5cn1/72639713489.pdfIn PDF document text
    • http://ahs1978hounds.com/clients/0/09/09313dc2b2b2138818c22350edca9cf7/File/27437374705.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160da89503ae4a---xuvaxalevor.pdfIn PDF document text
    • http://www.prctech-th.com/ckfinder/userfiles/files/72200971978.pdfIn PDF document text
    • https://slezanie.eu/userfiles/file/jigubogiwapagizafig.pdfIn PDF document text
    • http://capableapp.com/uploads/files/32614044142.pdfIn PDF document text
    • http://bagumul.com/file_upload/spaw_upload/file/20210508201341.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16075ec9697ccd---kerimivodopiwijasisefu.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/liguzumawi.pdfIn PDF document text
    • http://portsreunion2021.com/clients/b/b1/b1889431de095b9710a1303a3c619afc/File/sigapafoboxat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=gregory+crewdson+untitledPDF 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_off0000f91b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF91B 18668 bytes
SHA-256: 805ff3f9d430329c8f92a28249cb0ec1ef1acffc44962e179602873ffb5fb171
font_01_sfnt_off00012920.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12920 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014137.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14137 10720 bytes
SHA-256: 0452ecef5939a30d25caf90c9676e8f4a1ad20b99f689bdc4ed059025b9aee37

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