Malicious PDF — malware analysis report

Static analysis result for SHA-256 efc72d75aa07704c…

MALICIOUS

PDF

81.0 KB Created: 2021-09-08 12:00:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 71422cca996a212845330fa7db7c33b0 SHA-1: e98a6e397cf21a1a2f037c0483dde0303cdabb33 SHA-256: efc72d75aa07704c03e3e5989cf4b11cce34ee538f1f49ebfa656ec2372e1e8d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a phishing or malware distribution campaign. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this. No scripts were extracted, but the overall structure points to a malicious PDF designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://olneyjune65.com/clients/d/dc/dcef5d22f85ec69f5810ba62c2e8cf46/File/25498106917.pdf In PDF document text
    • https://jensbrode.de/files/file/zopadukarowa.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/d062cd596dc75ccf961bd85d8d520015/finozaboxipagelolurelo.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/76977794589.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/xugupu.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/retitunurivoden.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/4a455da4046d21d92ad960e906048888/gupeti.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/8fe5f7b6cc2660f90af52ce1712c064f/ruwomad.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/jugutimone.pdfIn PDF document text
    • http://execdentalclinic.com/uploads/ckfinder/userfiles/files/wagixaxirejoxe.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/mitodewabopofafagiw.pdfIn PDF document text
    • http://doubles301.jp/files/ckeditor/files/gobinotetipisulurip.pdfIn PDF document text
    • https://mimpishio1.com/contents//files/fufexu.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a5f2e19105---sabofomi.pdfIn PDF document text
    • http://hosungtour.net/FileData/ckfinder/files/20210718_3C806455FEB94286.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607f45f665ef6---tesapumab.pdfIn PDF document text
    • https://mollis.rs//files/subakalanesaf.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/tekuzevexivaxarulupuzep.pdfIn PDF document text
    • https://ldoris.com/upfile/files/20210720230238.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/9507376396.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/0f46a86d5cb825d04d7fa5ee62be59ee/10956055798.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/38031761364.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/tiwud.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7ac9d094b---33696938323.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=adobe+portfolio+convert+to+pdfPDF 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_off0000da70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f287.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF287 10472 bytes
SHA-256: ac6622e0ba662fa5728934a3a1f0f982850a9b1cc5d2bb67dc0a05bc4ecc64bb
font_02_sfnt_off00010a28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A28 17220 bytes
SHA-256: f28511c54b3939629078ecfca4d62a93e1aa1ae0cfe66d6e3852cf526619dd64

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