Malicious PDF — malware analysis report

Static analysis result for SHA-256 d703a9b5e09520f1…

MALICIOUS

PDF

226.4 KB Created: 2021-07-05 10:28:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 4a20015d315f1a21c5066a3c8545c8a2 SHA-1: 9696bd23d8b3f96c26339610a47ef353371619ed SHA-256: d703a9b5e09520f17a35e0f7d9ede9ab98f06ddd4ec1144e6d9011243ca161d2
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Several heuristics point to the document containing links to external PDFs hosted on compromised CMS upload storage, suggesting a phishing or malware distribution scheme. The document body is unreadable, but the presence of numerous unknown URLs and a PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristic strongly suggests a lure to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8934

Heuristics 5

  • 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.
  • 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://rzfmuhasebe.com/userfiles/file/gazedasulelaketura.pdf In PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160be10ccbf6c6---84029494784.pdfIn PDF document text
    • http://primaneighbors.com/userimages/9115750614.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/b707577ecf44ecde9ad0204b432763b1/38205185316.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/16083f1ed40bed---nabovilepijiget.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/5dc75910aff4b2a9aac96b1a75a8a2e9/doxopawedonimewunosol.pdfIn PDF document text
    • https://porterbrothersltd.com/app/webroot/uploads/tevusatuxurafivewun.pdfIn PDF document text
    • http://cz-synergy.cz/data/file/somefatati.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/3h993tilbovek5j5o4amnla0gl/zuleli.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/422258d1557190087e0368dd71ee9c57/25817232725.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e2fcb5bc8---55318424446.pdfIn PDF document text
    • http://brixtontaxi.com/survey/userfiles/files/nobugutiriku.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ce48c8e15---52906129728.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe0333721e---xefowi.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adef65b8233---3494898324.pdfIn PDF document text
    • https://red-adlay.com/upload/files/xanafuwominomewoweja.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/50785219122.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/4pcdhfe0jp6795lmp2abldq3ip/60556631079.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/ar2i1hgis6er8kc0d2glf1dhqq/78193528147.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/68e97b51c64476494205ca9789f22edc/52614399009.pdfIn PDF document text
    • http://marinda.ru/pics/images/file/guvasadavivizibazosepazex.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/7c2ea6c700b1ca87664b84ee5421a33d/fawog.pdfIn PDF document text
    • http://bukharasuwanee.com/sites/default/files/file/55840589686.pdfIn PDF document text
    • https://candbco.com/ckfinder/userfiles/files/zikatoja.pdfIn PDF document text
    • http://beiwendq.com//data/attachment/file/92065539929.pdfIn PDF document text
    • https://finances-canada.com/wp-content/plugins/super-forms/uploads/php/files/7d0e53fed4e40ba3b64a40c539b6edc2/94369683954.pdfIn PDF document text
    • http://jentretiens.ch/uploadimage/poxipumebevenidowobejunex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=blue+winged+parrotPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011edf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EDF 210204 bytes
SHA-256: b698df51be43d0d2e3d8c5a6e9ef97e5c1fe6d73c5c3e46d6eee1749b8aa3cf7
font_01_sfnt_off00031a0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31A0A 10640 bytes
SHA-256: f48adc7e5d6a79a36016996832cb615b090216370c838837da45f36968c6ca5c
font_02_sfnt_off00033255.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x33255 17964 bytes
SHA-256: 4e914198f6469612188cf2d69dc65d830636594e547c40a138e520d6a8a7294c
font_03_sfnt_off000361b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x361B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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