Malicious PDF — malware analysis report

Static analysis result for SHA-256 a420134a7e313966…

MALICIOUS

PDF

91.5 KB Created: 2021-07-26 10:09:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 7b4341ff2f5f270acaf8dc863e79103a SHA-1: 2b35b4028516bc22d529883f5c6f4d10c352c9af SHA-256: a420134a7e313966a3a509589a7c05e1537b332f3b50cbfec2af5bb2f5bef640
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by multiple heuristics and an ML classifier, with ClamAV identifying it as Pdf.Phishing.Trojan. It contains numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and embedded content indicate it's part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9509

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160977ab3a7e8e---gasejefemilaxidiwej.pdf In PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160b9fea4ea2e2---37331031004.pdfIn PDF document text
    • http://sgd42.ru/userfiles/file/rajijukokelofulowovidew.pdfIn PDF document text
    • https://xn--mgbaf4adbs1bd2i.net/upload/ckfinder/files/410329607.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/891de2c9e9f0a88816070991a9aa3dab/79369825421.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/hmrpfo3g046m8igg3p5s57ar42/7914856264.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d6307cf97---47737932527.pdfIn PDF document text
    • http://wenxuezj.com/images/File/56501177022.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/eigk6vslsfo52pdrh1fvjm0tkv/84995770204.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///86501132562.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/c464897c5fc13f6d1d6246d135ec4554/murum.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/22006b8106bc486f1e926cf689f34148/90999684781.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/t2oe2bb296080f4p1i47tmf9lb/kisovuzezunabevaminatiput.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1607836378fac3---83046542002.pdfIn PDF document text
    • https://citytrafik.nu/images/file/segoxapufufavedowu.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/17029590735.pdfIn PDF document text
    • http://fletcherfamilyreunion.org/clients/52745/File/pevopeziburesavix.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160a926c98f5fe---10360859884.pdfIn PDF document text
    • http://vienkiemis.lt/app/webroot/uploads/userfiles/files/fabibiguxirunuxaxusa.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/gajesujoxejixov.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093a05b6305d---rixur.pdfIn PDF document text
    • http://chongros.com/userData/board/file/83284645110.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec88feabc7---67977191000.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097d929b7fbb---15341167995.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=%D1%81%D0%BA%D0%B0%D1%87%D0%B0%D1%82%D1%8C+%D1%84%D0%BD%D0%B0%D1%84+2+%D0%BF%D0%BE%D0%BB%D0%BD%D1%83%D1%8E+%D0%B2%D0%B5%D1%80%D1%81%D0%B8%D1%8E+%D0%BD%D0%B0+%D1%80%D1%83%D1%81%D1%81%D0%BA%D0%BE%D0%BC+%D0%BD%D0%B0+%D0%B0%D0%BD%D0%B4%D1%80%D0%BE%D0%B8%D0%B4+%D0%B1%D0%B5%D1%81%D0%BF%D0%BB%D0%B0%D1%82%D0%BD%D0%BEPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/704a0ef3e68053363142757d53dc0769/kijilixezod.pdfIn 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_off0000fe9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE9A 22908 bytes
SHA-256: 85e529278f369308725665cba2af5691249291aed59820ad2d6c7f7e02690ec0
font_01_sfnt_off00013765.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13765 11644 bytes
SHA-256: 561fdce3c020b6434eae637d787f1f52b08556d0ac3c8a742a310d54d8d25888
font_02_sfnt_off000152cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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