Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2dc6c64cbbc5d6a…

MALICIOUS

PDF

82.4 KB Created: 2021-09-07 04:07:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4994f74d13bf7b4d434548734049fd85 SHA-1: 081698931d76e3d8518c1cc033da99a6d49554e5 SHA-256: d2dc6c64cbbc5d6a0f634664520124881f3212da4e01fb843630b6c7d117b577
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/ok29etehnqeupc0cekkqu6cq56/83489458852.pdf In PDF document text
    • http://holmeslawfirm-iowa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kidadetakotokibodew.pdfIn PDF document text
    • http://security-m.jp/tool/images/file/65085747131.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/90ee77ea24867d07e11b638fd7a751e9/zurenidibesifi.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16079d0424ce0e---98552499657.pdfIn PDF document text
    • https://servicepapik.ro/files/gamufudovikulizasaj.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e726e91267---moxuvijajiligej.pdfIn PDF document text
    • https://nestaerospace.com/uploads/file/gojotukaket.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160add5bf60128---wizono.pdfIn PDF document text
    • https://bauarch.bg/files/52193472968.pdfIn PDF document text
    • http://blueleaves.ru/userfiles/file/44769557290.pdfIn PDF document text
    • http://hawaiianhunareiki.it/file/tosonenimekilatikixen.pdfIn PDF document text
    • http://samurairamenbar.com/uploads/files/lewuz.pdfIn PDF document text
    • http://fabtur.ru/upload/files/76286197537.pdfIn PDF document text
    • https://mancomunidadvaldizarbe.com/userfiles/files/23082991947.pdfIn PDF document text
    • http://iviltra.lt/images/files/dexivexesugisevef.pdfIn PDF document text
    • http://fpole.ru/sadm_files/97010862093.pdfIn PDF document text
    • http://chromowane.com/userfiles/file/31760210407.pdfIn PDF document text
    • http://epodhajska.eu/UserFiles/File/84221227889.pdfIn PDF document text
    • http://i-physiology.ru/upload/xekonexadufa.pdfIn PDF document text
    • https://gabconstruction.com/ckfinder/userfiles/files/98065991785.pdfIn PDF document text
    • https://songhong.info/userfiles/file/7016741986.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=percentage+decrease+worksheet+with+answersPDF 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_off0000d917.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD917 18992 bytes
SHA-256: 1f6698d40f7e609fde5d596dff9880c7f80c5670d66093664bc5832cefd826f8
font_01_sfnt_off00010aff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AFF 10780 bytes
SHA-256: dda5fc755eb470f8c69517d4512ea0ccea1eeeef560411a2ab412f9674601f51
font_02_sfnt_off000123ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1