Malicious PDF — malware analysis report

Static analysis result for SHA-256 76c4dfe5c0f1ed06…

MALICIOUS

PDF

98.6 KB Created: 2021-06-26 00:10:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0df1815842aecaae5a497640b09c8e20 SHA-1: 9ad0750ebbb66c36ca5184c62bec4d8bb3aa8bb1 SHA-256: 76c4dfe5c0f1ed06854b60664a36d5995daab1c4ecf9455e28734bf35278f6e1
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the presence of multiple compromised CMS upload links is a high-confidence indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9895

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://teenvolunteerhouston.org/wp-content/plugins/super-forms/uploads/php/files/c228c2268fcc170a82929474d9035887/16536126942.pdf
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6cb67691d---91476352554.pdf
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f85ef22869---23526771433.pdf
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0b6400f2e1---48732456555.pdf
    • http://elfuklid.cz/foto/Image/file/83877720016.pdf
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/16668e2694f6169cbbc504a4f00f6d58/robukoxaja.pdf
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/49cbfbfab227d6ede123b3006b6cc39f/vufenodezazafovotez.pdf
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607badcb1204a---pitebisobenolo.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b3a902648---53229389898.pdf
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ada8145d1d6---37098584773.pdf
    • http://pogservice.ru/userfiles/file/83709552490.pdf
    • https://www.epicbrands.co/wp-content/plugins/super-forms/uploads/php/files/087f8624e74b45c1c54015bf0cbe1dee/binasexogodixisil.pdf
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1a3a755bdeb977bd86444ad13201c4e4/pabazitaduvefojukuzi.pdf
    • http://findmecakes.com/userfiles/files/siletusimuxawi.pdf
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606c699616925---92236818542.pdf
    • http://3xlove.com/uploadfile/file/80246169892.pdf
    • http://richmediahouse.com/admin/uploads/file/zafad.pdf
    • http://doktor-okonski.pl/uploadimg/file/pewugapupovanisape.pdf
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078982407a8d---sokevovoli.pdf
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d32127cef5---38151728865.pdf
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077a9069ab2b---wefotimu.pdf
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/167c7fa6da37f2ebb43c819c7c550857/pejinarot.pdf
    • http://diamantina-joaillerie.com/ckfinder/userfiles/files/fawutakulatezepir.pdf
    • http://langeline.com/ckeditor/upload/files/komugoganamarujulaxipaju.pdf
    • http://hasyo.net/files/file/mewugu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=miscellaneous+expenses+meaning
    • 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
stream_005_off00014e31.bin
9ea9eddb9ee870081713c39b23b79ab2a4dac235db2842acda1e0cf1ff4f40ab		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x14E31 25656 bytes
font_00_sfnt_off0000f0a6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A6 16792 bytes
font_01_sfnt_off000108b8.bin
4943295b0c4260c22df12b3782bc20695ad94f8c4f7d90be83dd16c69bb29afb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108B8 17332 bytes
font_02_sfnt_off0001359e.bin
440a0c69d9005973edf9629a9ee26130005549f19edf4fe27d3e095c4c181c9a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1359E 10716 bytes

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