Malicious PDF — malware analysis report

Static analysis result for SHA-256 597ec47effd4f4d8…

MALICIOUS

PDF

110.7 KB Created: 2021-06-27 01:49:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: b7f123161fbb98457716555edc956ac7 SHA-1: d81f05e7c857017f0522430caad24243a19b5cb5 SHA-256: 597ec47effd4f4d8b1879d81a63d408e65a5bf593f5d06764483a002082412d6
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Several heuristics indicate the PDF is a link farm hosted on compromised WordPress sites, with URLs pointing to potentially malicious PDF files. The presence of these links suggests an attempt to direct users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9698

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://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160962234c9da3---47513037776.pdf In PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a51c2aed52---zibetaxanosuxun.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160a6af96ea4b4---dudavot.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/t6a5bqree51rakmplvi2b5ljo5/rorivoxe.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/5954630876.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/58247767879.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/3346863610.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/29992073701.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098adaa3614b---87159423035.pdfIn PDF document text
    • http://worthingtonpark101.com/userimages/nuwifegitone.pdfIn PDF document text
    • http://lagunaapartman.hu/images/user/file/libikewexipajomur.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/334c4491692be1daa096a484417649e6/subotenexekugopa.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/0de920903f6951c0fed1e17782dfc672/kosibavobotivopobapomib.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/livovibimomunufelifufuji.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160890bafc04e2---savejal.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/lusamol.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608e981475392---85836036251.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be631b80861---58182562782.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/tifiwulijerelafabar.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d35f512aa---17115493257.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/tjm69lrkiu3nkrn2jmkht0uo4g/zeliv.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/femixewawowe.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606d49c21cf76---wuwofositirutiguraro.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/venatasatibomavejux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=a+thorn+in+my+sidePDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001003f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1003F 28012 bytes
SHA-256: 9ec44ed4373b21550666aaaadcddcba2d1dd2756d27f6949277ee28716b9bfc9
font_01_sfnt_off0001426c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1426C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015a79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A79 4148 bytes
SHA-256: d7303cca28d402b77e210c98f25e27684ffeccf168a820f82120d16fefa42e06
font_03_sfnt_off00016a1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A1C 23920 bytes
SHA-256: 2bcb3d1c1c4b48205ea8224faf1ec4818b71701a250d075b08b2f2e5b6399145
font_04_sfnt_off0001952c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1952C 10400 bytes
SHA-256: fd04d284a37de6b8365869f643ac934fe5a2f1aaae5d5fd9e53885b585d5322c

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