Malicious PDF — malware analysis report

Static analysis result for SHA-256 49b8199edcc400f0…

MALICIOUS

PDF

87.1 KB Created: 2021-06-29 02:20:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4dc262cbe238e10a5d277b4c89375108 SHA-1: 976a8b3e59b35e82cd4eec23f5cb3cd5fc7c0655 SHA-256: 49b8199edcc400f03fb776eec9110c22a3c05628a3f6b0751d99fa98a713dfd0
204 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links to external PDF files hosted on compromised WordPress sites and disposable hosting, suggesting a link farm designed to distribute malicious content. The presence of a 'download button' lure and instructions for a password-protected archive further indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/0e201ed4ad3562ee766f34aa09b486e0/53963877670.pdf
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/76fg0ml69e06j6lna2h7b7nfs1/62581209365.pdf
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9bbd0c3fd---kazovolujiwow.pdf
    • http://kwong-cheong.com/userfiles/pemadigudesotaduxavuw.pdf
    • https://an-professional.ru/img/files/file/38973693858.pdf
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/098881b41e457f24b2a94d6d35ca9dd5/totox.pdf
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160c9560fb4124---88494599453.pdf
    • http://ashioke.com/images/library/File/26239865446.pdf
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/ee0e6b8bd915225343ccfd21df9abc0f/mazikovipomezolinoker.pdf
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c2879fab144---70688106172.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609da77d9e388---rugivu.pdf
    • http://drivingschool-brno.eu/files/9100379836.pdf
    • http://minerva-collection.net/files/files/69603059348.pdf
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce3238d8fac---86158165093.pdf
    • http://unternehmensberatung-hegenbarth.de/userfiles/file/41863790929.pdf
    • http://nedirajtebosnu.net/userfiles/file/46980677138.pdf
    • https://mytekas.com/UserFiles/file/2146532505.pdf
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608b41b88cf35---28298325436.pdf
    • https://alatheir.com/atheirwsfiles/file/80205320288.pdf
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/u8is5mm6npv93g9mql1cmh0754/57650522824.pdf
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/2a0b5753a38435fca81e6522b2f03dd4/55370093457.pdf
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5a8777655---58154997157.pdf
    • http://computer-rudolstadt.de/upload/file/68212030514.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094dfa5423ba---48551861301.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=pdf+library+android+open+source
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef92.bin
a0491f91bfc6514f24cd2d66720a1f9685e51af66c386d5c0833177237f51763
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF92 10872 bytes
font_01_sfnt_off0001088d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1088D 16792 bytes
font_02_sfnt_off0001209f.bin
6a1d5b20199e1921ec488150374ec3876b88648596d91bef9b5f84d6e846368f
pdf-font-stream PDF embedded font (sfnt) at offset 0x1209F 17528 bytes