Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b389704bc463b2c…

MALICIOUS

PDF

72.9 KB Created: 2021-09-23 13:02:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9bde838392c4e44c93900db23d943480 SHA-1: c73c7d623572510fc9f0edb5be310fbfa8693dac SHA-256: 8b389704bc463b2c46446ce47fa1fc0e56e19fa87591e1f4f4331e168b0d0c6a
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 websites or disposable hosting, indicating a link farm designed for malicious purposes. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://zagorjeadventureteam.hr/files/rekanekogufubexu.pdf In PDF document text
    • https://maintogelonline2.com/contents/files/68598304935.pdfIn PDF document text
    • http://scard.vn/app/webroot/uploads/files/dewaxizozozonuwuba.pdfIn PDF document text
    • http://utcsp.rustyramone.com/uploads/files/31531379144.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/fokedomapugel.pdfIn PDF document text
    • http://drtamerturan.com/file/69500527859.pdfIn PDF document text
    • https://namphuctourist.com/userfiles/file/soketefiledapanalewosazo.pdfIn PDF document text
    • https://huaienclinic.com/uploadpic/files/lepizidur.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/51573170273.pdfIn PDF document text
    • https://monamifrance.com/FileData/ckfinder/files/20210911_8199E981CF66B671.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16130056fc7a02---lojosuv.pdfIn PDF document text
    • http://studiovalecchi.it/userfiles/files/36349010848.pdfIn PDF document text
    • http://invismortgagebroker.com/images/file/74696544981.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1614895677cd16---wirofirevowonov.pdfIn PDF document text
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/3141643351.pdfIn PDF document text
    • http://haustechnik-hagenauer.at/74149377497.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/77604507531.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/kadufusigimixodifoboboxi.pdfIn PDF document text
    • https://cupanghitam.com/contents/files/rebalum.pdfIn PDF document text
    • http://irths.com/upload_files/files/sevol.pdfIn PDF document text
    • https://self-storage.sg/images/uploadedimages/file/8949304160.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/dusironetutifi.pdfIn PDF document text
    • http://fermobkorea.com/userfiles/file/20210907180720.pdfIn PDF document text
    • http://acril.ru/ufiles/files/75629660268.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16148beb61999b---50172420787.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=friv+2013+free+online+gamesPDF 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_off0000b9b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9B3 10968 bytes
SHA-256: d461daaab4ae629639ccdc89a61cd2348bc7576cbabc3d18298a9c45d794e6ec
font_01_sfnt_off0000d339.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD339 16520 bytes
SHA-256: fb5acf4d33e97631a89bc6bf6b495661e11c0a9460b6abcc2d70a9645ddd5fe5
font_02_sfnt_off0000fdca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDCA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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