Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc5b6fe8d7960bbc…

MALICIOUS

PDF

73.3 KB Created: 2021-07-20 00:01:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3d72a36f49ef099e366ff26f9be917ad SHA-1: 94b00c979325ff81d78bc0dac2e377d3d41563ab SHA-256: bc5b6fe8d7960bbc4ab2d0e7f859f874b447b94b97b11789844acbf3fb1415df
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF acts as a link farm, directing users to multiple external URLs, many hosted on compromised CMS platforms or disposable domains. These links likely serve as a lure for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://tierrettung-in-katalonien.org/ckfinder/userfiles/files/suwutozojat.pdf In PDF document text
    • http://bungefamily.com/clients/5233/File/87908847257.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a03dac73c93---66570950613.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/21396635936.pdfIn PDF document text
    • http://aiskreunion.com/clients/b/b4/b417c2091670ce0b0d78f4b231aea02c/File/fukosatas.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160e4f1b2e5356---lesujux.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/65609447705.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/b9139d3f257a1b0b5fc2097effb77a75/57723081895.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084cbf8f15d0---katarubojutozoxoz.pdfIn PDF document text
    • http://travelport.pl/userfiles//file/dafulenojudo.pdfIn PDF document text
    • https://andana.us/files/files/bamubopokexudubuva.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5c9f80e23---zotakorater.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/femimiwofijulemisus.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/29719785208.pdfIn PDF document text
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/32694390213.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/98176435336.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a6e45013a---73073667636.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/6cc7843fc2fce7ccad0bfce7e6d85bbf/95146958697.pdfIn PDF document text
    • http://scpt.it/userfiles/files/21218971483.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160866f8962a74---67809056788.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/34929878852.pdfIn PDF document text
    • http://janandpoos.com/clients/872640/File/kinabok.pdfIn PDF document text
    • https://thuaphatlaihoanghuy.com/uploads/files/49875214755.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16097a6d7667d3---mivusanajukugowoxirezi.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/c5601299cf5048a8e48982a46a389430/tevujupanoludo.pdfIn PDF document text
    • http://temple.mo/userfiles/file/wobosapodew.pdfIn PDF document text
    • https://petrovsky14.ru/docs/files/2302082288.pdfIn PDF document text
    • http://jhsclassof63.com/clients/c/c8/c8cc7cee7579ddcd469b669c0eb172d8/File/milagamizuli.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=2+guys+pizza+hoursPDF 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_off0000bdab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d5c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C2 10448 bytes
SHA-256: 68a780eb6354e870a3e7b9f64f2d93d0c4d03403440a85d2ed21d65addf75354
font_02_sfnt_off0000edac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAC 16536 bytes
SHA-256: 7e3cded6b5699c69bb1bc93556b03aa77ec0a1943e6094141dac66b1f8fd547e

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