Malicious PDF — malware analysis report

Static analysis result for SHA-256 417c01b0371a01b4…

MALICIOUS

PDF

77.5 KB Created: 2021-09-04 07:19:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 736aa327f0238b010688cfd26e2aab0f SHA-1: 6b342e1032f6559a70d42bac98d84e02a3e0eecd SHA-256: 417c01b0371a01b41bedea11319c4fb71a8388a221617e7debcc04efe0d4137d
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. Heuristics reveal it functions as a link farm, directing users to multiple distinct hosts, many of which appear to be compromised CMS upload directories. The presence of numerous URLs pointing to potentially malicious content supports the classification as a phishing or distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://debandhelder.nl/ckfinder/userfiles/files/wimizegexoxewovibivo.pdf In PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16099eb2121e50---37343692283.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/58645886142.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609a156e9be0d---96304908194.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fa6153380a8---delipaforesevokuwa.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076e759377b6---32110133182.pdfIn PDF document text
    • https://magyar-logyogyasz.hu/fileok/file/96584657163.pdfIn PDF document text
    • https://littleedupark.com/ckfinder/userfiles/files/17252618157.pdfIn PDF document text
    • http://xn--o79av69abka850ab6c.com/upload/file/202105310924233788.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/317eae4d7ef0d8378cbafe51c6239d63/posefer.pdfIn PDF document text
    • http://metapolar.hu/tmp/78939621757.pdfIn PDF document text
    • https://tenshinorchids.com/FCKeditor_upload/file/nuzixonorafa.pdfIn PDF document text
    • https://mediaget.ru/userfiles/files/14214283993.pdfIn PDF document text
    • https://mashtalkandil.com/userfiles/file/mikujipepakolisoki.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606f410785416---mododaraf.pdfIn PDF document text
    • https://mekongtransport.com/upload/userfiles/files/damidulaz.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb1d57dc622---48146779699.pdfIn PDF document text
    • http://selidbe-beograd.info/files/baperelikesejaridokug.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/eacc337e438c7025ce6892f1f5f59a8e/tubalarekajawerozig.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/7ltg0c0lf7k4802jo18u934fh1/nugepipip.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bgen2396auc9mlvb00k7i1bsq4/gekewufufevafif.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/96882375036.pdfIn PDF document text
    • http://kaies.net/upfiles/file/82765534755.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/mceka4d841il0i0aaor8agrtoo/55195997284.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=cara+mudah+convert+word+ke+pdf+onlinePDF 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_off0000c457.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC457 19312 bytes
SHA-256: 8a3e6d2b6efd6075030614dcd543e5f42b8a134521f18a483eac34d6c487d6e1
font_01_sfnt_off0000f615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF615 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E2C 11092 bytes
SHA-256: 7fb1ce33fab4cd109f638d5d6d1158db3ffcd0b7a4e3abd638a4a58f6c653944

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