Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a5ec76c70c188dc…

MALICIOUS

PDF

93.6 KB Created: 2021-06-26 01:59:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4247d70b0d784e4d711dfcca47941ee4 SHA-1: 7983416afdfb19124eadf254edbea5ef359ee777 SHA-256: 2a5ec76c70c188dc7d6942396c6bd474a17a12c97e2281fa41407f91bd321c0e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links, many of which point to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. While no scripts were explicitly extracted, the structure and URL patterns are indicative of phishing or malware distribution attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5159ac8c8---42516941.pdf
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1608219369700a---51474811670.pdf
    • http://vietxetai.com/wp-content/plugins/super-forms/uploads/php/files/d94o0vavrssum364vlllv8tf5c/lorulapigofadovobujid.pdf
    • http://soldresold.com/Shradhdha-Mehra/soldresold/final/ckeditorimage/files/2439749178.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/3a59513da60e498d5a0b89b926e8cec2/newuximepowajoxubomefax.pdf
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ae4703dbe83---76622475320.pdf
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071828d3e24f---86025521626.pdf
    • http://apluskleaning.com/admin/images/file/zazivogoj.pdf
    • http://slanfusa.org/clients/47225/File/jikipexolexofom.pdf
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a847bfc8197---nowozujaka.pdf
    • http://szao-spb.ru/images/news/file/70013627736.pdf
    • http://omonetach.pl/foto/ilustracje/file/83745181690.pdf
    • http://contextuae.com/resimler/files/40969215258.pdf
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/90f56f2926e18bbcf53bb3deadd4fc13/pijivufekunogok.pdf
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160869d470f26f---gomakinaritu.pdf
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160868d2c7e768---75843368284.pdf
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a70437a8492---36373697630.pdf
    • http://kiavysocina.cz/UserFiles/File/48369468767.pdf
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/4l1dsj9mshqj9uvi1fkeldjjlr/fuzufamofofuwetumil.pdf
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16090d20881c4d---gepeweriwejifudizisikif.pdf
    • http://wsp.pl/userfiles/file/vegimiguxudiwezopil.pdf
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a875aa92e93---34578113915.pdf
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/2242bfec147fa4cfd1368fd7aaaf31fc/24604862128.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=list+of+the+elements+and+their+symbols
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f500.bin
f2666e95f4599b990980a0abf2f374fe3006e34437484733904d739abeeb93bf
pdf-font-stream PDF embedded font (sfnt) at offset 0xF500 16228 bytes
font_01_sfnt_off00010ae4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE4 16792 bytes
font_02_sfnt_off000122f6.bin
37feb1d8620f7dc2af69cd0d261a10b809d9845b02d949ccdf1faca6a47ee6cf
pdf-font-stream PDF embedded font (sfnt) at offset 0x122F6 16580 bytes
font_03_sfnt_off00014e1a.bin
01f87c0db873d51dc5fd29188b1b6195bdc3c70ccec083a41b23f9703c3f526d
pdf-font-stream PDF embedded font (sfnt) at offset 0x14E1A 10832 bytes