Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9b2042ba549fe9d…

MALICIOUS

PDF

93.7 KB Created: 2021-06-26 08:46:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 7f639bac5da0fc66f603ae04a127bc30 SHA-1: bcb2a3ff6635fe447dbd1b0ef3efc3a7e9aaba60 SHA-256: f9b2042ba549fe9dd999e8814126a69a47a41587c0ae06fc8453e41d1c0371d1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, 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 delivery. No scripts were extracted, but the structure and URL patterns are indicative of a common phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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.asslar.de/downloads/61280505827.pdf In PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/d92f881a246d682aa5de424a9c5f75d2/zewimidutotedar.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088c063a1957---27499145457.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/3e44344118459e2fd4345a6345ab585d/botag.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/9fa8969d64147897cd1e2694dd8b3bc0/12342379556.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fdf61e408b---47870619496.pdfIn PDF document text
    • http://yuha.be/_files/file/kuxizunijegisiv.pdfIn PDF document text
    • http://jmdfhjl.com/fckeditor/userimages/file/50732967924.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160990a70b4dce---10944121741.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609b3e491c670---88784931029.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/b04ad1157df221adfb34a10358d186d7/67527870694.pdfIn PDF document text
    • http://studiomarazzi.eu/userfiles/files/zeguzivadukizirosadojet.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f097262fb6---mupikeroduzeruxufag.pdfIn PDF document text
    • http://pastoret.it/userfiles/files/ninipovewagaruwumuma.pdfIn PDF document text
    • http://zonweringbelgie.eu/ckfinder/userfiles/files/15704652435.pdfIn PDF document text
    • http://mmbc.cz/_data/user_files/file/43521432450.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0098c8b02---modoxegakarej.pdfIn PDF document text
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/dafd79b6200ceae06b738fec01809eb5/wasujulavilefuxaxixi.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/002e0dc46c829d1429785363ec0729a3/xuvokalus.pdfIn PDF document text
    • http://lltsg.com/uploadfile/file///2021060318232281.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607306b3a4b01---pewojamatukekebituxijek.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/835c0ed53586656362ca6e5b49485a90/tekatowapa.pdfIn PDF document text
    • https://shidoremicrosys.com/media/sigonitekizinawabega.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=thank+you+love+youPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/a739a8db531a126e83b9ae1bffaf1739/vekalumiw.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f202.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF202 17544 bytes
SHA-256: 69a93a4441d44d3d024cd58ab6708a1c9b217cf7a1c515453acd84b418a00463
font_01_sfnt_off00010ce2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE2 10080 bytes
SHA-256: e7fa22c7f8fe02c9f0a96e38f756b922e14618cd9ba27c477a44b9c75eb45e4c
font_02_sfnt_off0001234f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1234F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013b61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B61 17248 bytes
SHA-256: 5900ea8163c99050eafd919ab6609968d8395208ebebbc233f14e57639c85541