Malicious PDF — malware analysis report

Static analysis result for SHA-256 014140b661a1d865…

MALICIOUS

PDF

84.9 KB Created: 2021-09-05 16:31:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: cf9dee4e32f8600a6ebae8b0921ab78c SHA-1: d438b0bdcf7e64f36f639fbdd3bd1fe38f7007d3 SHA-256: 014140b661a1d865e0612dc749367abb2146643093564ab55705088aed83627b
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many pointing to compromised websites and acting as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests a common tactic to bypass security filters by instructing the user to open a password-protected archive.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://douzonebnf.com/upload/file///wawapibiselugidexokub.pdf In PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/e68615d4db95957bbbcfd1695f252fc3/80920380257.pdfIn PDF document text
    • http://donghocitizenchinhhang.com/uploads/userfiles/file/lopugevakad.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c525b3edb9---talimafadefagu.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/21054504516.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f1764c79e---26411625498.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/344733a3fc87735f233ad9a723ca001f/16072407504.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/03tp8p6p74ir417l3tm6plesdj/47633014331.pdfIn PDF document text
    • http://ledson.ru/upload_picture/zokewumenodazutadegu.pdfIn PDF document text
    • http://shangrilayunnan.com/ckfinder/userfiles/files/76344627199.pdfIn PDF document text
    • http://sksound.com/userfiles/file/lajosuparajiw.pdfIn PDF document text
    • http://basaritarim.net/admin/editor_resim/file/sojaxude.pdfIn PDF document text
    • http://coss-wynn-reunion.com/clients/d/db/dbe3622004495b304d8703879a486b7d/File/rakopimobu.pdfIn PDF document text
    • https://jpt.mysmartedu.com/uploadimages/files/7776747057.pdfIn PDF document text
    • http://deborahmayerlawoffices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/97010029724.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/4f180593b2d087ced8fdb2c3be7bef24/88074880046.pdfIn PDF document text
    • http://obchodsezlatem.cz/upload/files/gobolebomadidove.pdfIn PDF document text
    • http://maekuangudomthara.com/ckfinder/userfiles/files/50853355364.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/64491383405.pdfIn PDF document text
    • https://brod-plovdiv.com/images/52700310811.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1611f13d5c9575---89436038362.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc07a2aea0---futesig.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/0nik89ltha8kum4ndbbnejkqm0/romitoresuvanu.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/8c38075359787b1c4e70e3fa09291757/93659124193.pdfIn PDF document text
    • https://questyme.com/userfiles/file/48871344081.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=tp+link+range+extender+manual+pdfPDF 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_off0000e264.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE264 19568 bytes
SHA-256: 2ebd0f6d6d57b3ee416f0b90239c03b5859935b0b18fb3a844b583ed4cfc33d8
font_01_sfnt_off000114c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012cdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CDF 10812 bytes
SHA-256: 7b4f37094c8ad80b33b305417d0adcfb4be0376e1e0b45df9e5f57b0093dc687