Malicious PDF — malware analysis report

Static analysis result for SHA-256 f03b213a4d7b36cf…

MALICIOUS

PDF

86.0 KB Created: 2021-07-03 05:47:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b3429cc2bf29a8924a373c4dcb8b97a9 SHA-1: 5ef1b70a7de6250d794be4e41b1528d8dbd609ac SHA-256: f03b213a4d7b36cfb78a2d294d182179d2b4395e570572810c9141b7b54f2b9e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160983340e5821---refilupidixetiwezilofe.pdf
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160beea2d4cf68---8056790353.pdf
    • https://ms01bet.net/contents//files/90343189717.pdf
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/1b203fdb93ea30bfccb04d7e948f35f2/jajeku.pdf
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e972ab8793---69325905116.pdf
    • https://kurek-rowery.pl/user_pict/file/kulotumogemakososerinibe.pdf
    • http://thegreenlegacykeepers.com/clients/e/e8/e8dc17949b7ef813e9937e453902477f/File/42559614922.pdf
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160851104d8b02---48056030933.pdf
    • http://bajcsidavidfoto.com/_user/file/nazoketimoxuxikat.pdf
    • http://skyline1968.com/clients/74864/File/16101553197.pdf
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3aac34715---91959639869.pdf
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160dddbf2c6060---mudegumebozifepafi.pdf
    • https://habibitours.org/ckfinder/userfiles/files/79231672881.pdf
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160703e1202821---89633109830.pdf
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/34e21514daf178fea24a1a14c270692f/52575967209.pdf
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b60149e39d1---54946777174.pdf
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/e5969bafce73191888da2a35f1ebe898/73294555142.pdf
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/a55a34773a4f31969d606030a93a52e6/zapenatudujugemajafozodos.pdf
    • http://classicalgardenstatues.com/uplds/file/15891732067.pdf
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac18df2f451---15051416066.pdf
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/16088ad999df4a---gasaturenagivunanenutog.pdf
    • http://dyglas.com/userData/board/file/levuzakezunap.pdf
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ce4e3200989---27593279157.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=large+to+small+pdf
    • 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_off0000e246.bin
3444e9c79de98e0cc72f28d7a697fa36d2daac159c3e58ae62e6c481d5b37168
pdf-font-stream PDF embedded font (sfnt) at offset 0xE246 10600 bytes
font_01_sfnt_off0000fa50.bin
f30ecc240b764779fa33d799cc1cd8e4a481f42321e5a920d4ef76212c4b8f33
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA50 18152 bytes
font_02_sfnt_off00012a1e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A1E 16792 bytes
font_03_sfnt_off0001422b.bin
15171638d69c9281a983de8a04f8d213e5ed86d33053034f6aa0dd130c4010d8
pdf-font-stream PDF embedded font (sfnt) at offset 0x1422B 1700 bytes