Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bdcb2c94568f754…

MALICIOUS

PDF

87.0 KB Created: 2021-08-24 01:03:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 73a67e0bbc89555e2d6a6cfc51ed61c0 SHA-1: 448ce3320c35cc42da953c67628bf3de86de09ad SHA-256: 0bdcb2c94568f75463ce8297013bc0db9536f19e7ef652236cce604319fcf8dd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML and ClamAV as malicious. It contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's likely a phishing lure or a downloader for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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
  • 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://dungcubepgiangtrinh.com/webroot/img/files/jenipomut.pdf In PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/6393bc4bd6888bef686fa49044f47533/38618226515.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202104/file/55622401295.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/6f0ba54c6b340323692a1d9554190b89/jikuzifipimelari.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/7478cbc2930847599fa6ad39db6f0026/9479079238.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/rani7fmma52q6gu2dc719gooie/kifivosirupob.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/xasekotiratad.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16086307be8f67---46143764125.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/57961836088.pdfIn PDF document text
    • http://riversedgefm.com/files/file/24483889688.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077c8800688d---41734664152.pdfIn PDF document text
    • https://sp-pir.ru/wp-content/plugins/super-forms/uploads/php/files/8b539df9780f79bbb9b0fb6c9de84fab/60908244215.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/75rtbgveca4nps8l1lrm40trq1/pebaxedozuvipis.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c779e59876---lufuzuvomuxirukuratuxuses.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161233ebf5893e---komosilasefimoladenekisi.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/umen32q2qlf0rqdot7fmtuc4bl/68087443400.pdfIn PDF document text
    • http://stardentalcare.org/userfiles/file/47959223425.pdfIn PDF document text
    • https://kheops-so.fr/ckfinder/userfiles/files/lubevuse.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/ccb20b702f0c4625d8604f4695726fff/97984549627.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/kd4a7e67naff697os8if3st7s4/58593312924.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/kpp2mso7cht9ngkq23p2v42te1/74127765699.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612040dc9781c---8690644840.pdfIn PDF document text
    • http://music-summer-courses.eu/upload/files/16187174614.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba83ba9768b---favigifivebipaxokijakox.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/93583320867.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160873218c1481---luzevavobotenaj.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/octg5btt1bh7c0qb21rfvt96g0/75780715954.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=aberdare+is+in+which+countyPDF 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_off0000efff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010811.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10811 16708 bytes
SHA-256: b56b76d67f4554b3a79055b8a36baf3cf783b20c1065bd275c71710ab2afc091
font_02_sfnt_off0001334a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1334A 10844 bytes
SHA-256: c9793f2d61e728593055613098538dbdbca4eb681f9dfa50d3598687fe0082a1