Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a872364404e53a5…

MALICIOUS

PDF

86.3 KB Created: 2021-07-20 23:38:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d29725ba0fcc645664d7b5c4a8da6785 SHA-1: b20d9c2cd93b4843ab0d7bb746796897f1f22f18 SHA-256: 3a872364404e53a57e7eb65138fa8da24364ff1f800ff186d3b29015465d0685
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating it is likely a phishing or trojan delivery mechanism. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting it functions as a link farm to distribute further malicious content. No scripts were extracted, but the overall structure and heuristic firings strongly suggest a phishing or malware distribution attempt.

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 http://guilfordvikingsclassof81.com/clients/4/47/479b0a304b4cdce99dfe3eda73a59016/File/lusukebobefimufubutimeni.pdf In PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607744917cd08---zonemodolebarunefojogixu.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/rujirasegarisenanotaxego.pdfIn PDF document text
    • http://phutungvespaco.com/luutru/files/33038521728.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607414cc6acc9---tegozegipaterabugunoteg.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210528_EF5A5F99087D4010.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc11798417---kabesagidilo.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/2271529183.pdfIn PDF document text
    • http://technocom.pl/editor/file/gaguwukatefatimubub.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a90cc29824e---sejatixuzasinumapo.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/j6invkndcl1jhbra5j94pv9263/20326356101.pdfIn PDF document text
    • http://vencedor.coop/images/admin/file/bavad.pdfIn PDF document text
    • http://dietetyka-24.pl/images/files/95680564217.pdfIn PDF document text
    • http://tablica-nieruchomosci.pl/uploades/fckeditorfile/20480924524.pdfIn PDF document text
    • http://asianaccounting.com/admin/fckeditor/userfiles/file/39738951948.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/20rpshbfua05jq07voq630kk30/tudozovapawafofavopidi.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/69745376984.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/gei1qp7kkgjj3k877q14l7lv2o/47535136079.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a84d2628dfe---3901285369.pdfIn PDF document text
    • http://eva.am/files/2348457205e7bc67.pdfIn PDF document text
    • https://ckmandarin.com/uploads/27135124220.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b5adebd28aa---76347801748.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160927930cdf3a---68160603228.pdfIn PDF document text
    • https://scavilecis.it/userfiles/file/gileloledawaxafetibo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=convert+png+to+jpg+white+backgroundPDF 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_off0000ee2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2D 11224 bytes
SHA-256: f9b9c75a4f51d7e5f3dc88208b0b01f107284b9ad08b17246994fd5dabc96a9e
font_01_sfnt_off0001080c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1080C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001201e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1201E 16728 bytes
SHA-256: 5f55c275932dcb2ced07af63a408fde8024b293365693459fc22e520d284d2fe

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