Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4527a2a99bea0b0…

MALICIOUS

PDF

128.1 KB Created: 2021-09-07 14:59:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 44dac0d71a94ffccefa436c2a77f8788 SHA-1: 5b9286c876f53cd63095a3e43f3e67813f48db50 SHA-256: a4527a2a99bea0b0670098508ce6677279028021cc3d004053fd7e22deb9cf57
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to various PDF files hosted on compromised CMS upload directories, suggesting a phishing or malware distribution attempt. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely provides instructions to decrypt a password-protected archive, a common tactic to bypass gateway security. ClamAV also detected this file as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 7

  • 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.
  • 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://smidgel.ru/uplcv?utm_term=historical+novels+in+tamil+free+download+pdf PDF link annotation
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc281d0f4c4---5780095538.pdfIn PDF document text
    • http://austria-ex.com/images/blog//file/likumuriri.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/lunetosi.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/83629016835.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/79833653660f0783eb67af.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/ssuucusmqodqcvcnjqhn0uides/piziwazugezise.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210605094144.pdfIn PDF document text
    • http://simonkuehner.de/gfx/userfiles/files/96503713286.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de5d9267a35---zusadiv.pdfIn PDF document text
    • https://nieruchomosciturystyczne.eu/files/file/fejakurabizorirabukabus.pdfIn PDF document text
    • http://wmsone.com/eimages/file/jodidafeso.pdfIn PDF document text
    • https://nestaerospace.com/uploads/file/259966483.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/161072d066fdac---wipufola.pdfIn PDF document text
    • http://villa-margherita.biz/userfiles/files/46459591645.pdfIn PDF document text
    • http://eubeer.vn/uploads/files/69097474421.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/62111237360.pdfIn PDF document text
    • https://kisikana.hr/UserFiles/files/33639625765.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/ne5fsm7n0spdt5j2idj678ecfb/13345128206.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a8cf9eaaa42---8389140094.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f116288f92---dewage.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb17cef26f---87477149011.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/c0ed3b4b95ea299920a9ba2d4b1d59e3/bukusewosubesagaxomupezuj.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160a1766a8119f---dufesatotapa.pdfIn PDF document text
    • http://banghenails.com/upload/file/53415504615.pdfIn PDF document text
    • 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_off000180ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x180AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000198c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x198C5 10924 bytes
SHA-256: efbbe2f962a1f554da24c5b102b006ad3e9ae11d6600d74806e7960a6ca4f8f5
font_02_sfnt_off0001b21b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B21B 25572 bytes
SHA-256: 53a334d1b84c5e854eab5033700e03dcf0f8c724e51cde1d8b9aeaa142c295de

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