Malicious PDF — malware analysis report

Static analysis result for SHA-256 efa11766e5cd76da…

MALICIOUS

PDF

88.8 KB Created: 2021-06-28 06:44:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 32ac7eaaa3cf4588a80a044f7cc8ec03 SHA-1: 87b079fe505616bce722fe456a7c9513c8f7d0c6 SHA-256: efa11766e5cd76dad5bfe8cd302d35c7aec60e38778cb4cc318b623c61c28b86
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to various websites, many of which are hosted on compromised CMS uploads, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics indicate an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/1357643df7801f9a8bf6897aaf47e58f/41900142973.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/7b0acced3d93382e1a2bbd980f0ed66a/51681120525.pdf
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/f2caf0eaaac554c5b8041905174fd5c6/94861929894.pdf
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/j4oalla7n7h7eu6a080lq49i0q/xutinuva.pdf
    • https://agentcctv.com/userfiles/file/32293020574.pdf
    • http://chizclean.ru/files/fck/file/43578640499.pdf
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607002259a3f2---33704159169.pdf
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/268dqpv5utncdh3t6bclhuppi0/48228448739.pdf
    • http://moscow-vernisage.com/files/files/vawadixadaribonoxika.pdf
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/f60f4e77b2c2902a15708903575f3d76/71057172469.pdf
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b4cf2933626---rebavepuf.pdf
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/pp4c7vhgt8m4bf8dnhfobtgj5u/2505033810.pdf
    • http://findmecakes.com/userfiles/files/90481785859.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/4aa4daf0ad23eb58177ead2a47123d82/9834918916.pdf
    • http://naucseto.cz/storage/buvaxezesaxusufavabovu.pdf
    • http://shethof.ch/cgi-bin/dynamisch/file/22491649262.pdf
    • http://lab4050.com/upload/editor/file/wikilenuzuzaditez.pdf
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16072f1a89d44a---nawunerovekaloronolagik.pdf
    • http://kartywspomnien.pl/uploads/assets/file/50062143101.pdf
    • https://tractorpulling-emmeloord.nl/upload/file/21856049164.pdf
    • https://agrimal.pl/userfiles/file/jusofazulokapesoluti.pdf
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077d10074ea3---jajukoruze.pdf
    • https://houstoncoinshow.org/FCKeditor/file/32422490479.pdf
    • http://nanumed.ro/uploads/files/60723226089.pdf
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160aa87ff6abe6---fagizobomovawuzunog.pdf
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/6q10adgp6r94pmll5bvc4hb2f1/85296880472.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=ucsd+transfer+requirements
    • 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_off0000f8ec.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8EC 16792 bytes
font_01_sfnt_off00011103.bin
c9ec84ac0a6a28d630bb3c313ff72533515dab7d84d97e51e158f7d2f7f3ce0e
pdf-font-stream PDF embedded font (sfnt) at offset 0x11103 10724 bytes
font_02_sfnt_off00012963.bin
c280b37eaeda97c9faf50d34fd97d67d91b0ee88a29f5efe341033ef08a744a6
pdf-font-stream PDF embedded font (sfnt) at offset 0x12963 17044 bytes