Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bd70e38536ed81c…

MALICIOUS

PDF

84.0 KB Created: 2021-07-07 02:47:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: d5830f7ea111f22db2f1afaf18256e1c SHA-1: 419e562ea4054d02481c547ca2142df5f57d7eb6 SHA-256: 6bd70e38536ed81cfe06b65ead3ec66c61d692ccb04e59135bc49478a39a1efc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external URLs, several of which are hosted on compromised WordPress sites. The presence of these links suggests an attempt to lure users to potentially malicious content or phishing sites, aligning with the characteristics of a spearphishing attachment attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/cb1aa32a0cfc4b52578f54f333ca5b77/20420779202.pdf In PDF document text
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/wikom.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a33e54c4f9---bifesobasejewifajiloted.pdfIn PDF document text
    • https://kaptenhoki.info/contents//files/70255995346.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/19942426317.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/17616443803.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e27b467ddc2---nexofoselalalowov.pdfIn PDF document text
    • https://bursakaynak.net/userfiles/file/kipaduji.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/fapinaratumagifuxomisuru.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/94116719744.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609447fe69aa4---16981655005.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608793db293b2---dawopafofojotu.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/93747114595.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160886eb57850a---remagosirafin.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607c683503181---xuzajekirizamidetiti.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc97c6f50a---73153641313.pdfIn PDF document text
    • https://tongdaidoanhnghiep.com/app/webroot/upload/files/texugusajavunejugakanutur.pdfIn PDF document text
    • http://yacpa.org/yacpafiles/file/wuzuvepejoluraf.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/253f76f1776110ecb4cfa8016c3f7928/dibigaxopana.pdfIn PDF document text
    • https://abhimaninteriors.com/ckfinder/userfiles/files/zafise.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles//file/kapagigigolejematadomug.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd34dd4201---bodevimer.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/5vdevfbkeeqk91h35rufleopfg/13542877921.pdfIn PDF document text
    • https://mindspacepsytherapy.com/upload/ckfinder_temp/files/20210526233121.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb11e1ac44---76350206735.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=the+amazing+spiderman+2+free+onlinePDF 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_off0000dde4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5FB 10988 bytes
SHA-256: 83b04f3542c5299d10b4eec6e231161be0ecf61908ce9e676ecf80bb8f3cc9ba
font_02_sfnt_off00010f19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F19 19060 bytes
SHA-256: 5282115f78ea3c50e198a63bd0442a13610b9217383fbf27be914f64a301bb87