Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1ed9229a3e6b559…

MALICIOUS

PDF

115.1 KB Created: 2021-06-25 15:22:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e78509d3644ffd1b76124075567d8831 SHA-1: 4c97f850a0b14a8746338ef7f0e8c2763ec519b0 SHA-256: a1ed9229a3e6b5594f7c9b18e75d95ef0c40df661e28db624c7bd7459763df1c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The presence of embedded URLs and the nature of the heuristics suggest this PDF is designed to lure users to external resources, potentially for credential harvesting or further infection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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 http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/c4503b31ad7f1a332ec37fbbac2a27aa/23341728954.pdf
    • https://p87.hu/files/16531482082.pdf
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/64sp7s52nbmdu2uo71di24pm80/20369973952.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160729fefe27b0---pavadakoretexav.pdf
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/4550e03c895db05d3e7355b75db86cf9/bibewifasu.pdf
    • http://alexanderjamesbackcatalogue.com/userfiles/file/womojuwumefor.pdf
    • http://www.pranabkumar.com/fckimages/file/47922263110.pdf
    • https://hirurgija.me//files/zijilonumobenos.pdf
    • http://pc75.net/upfiles/file/1624478100.pdf
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/f148bdeceef5a2bd18618444922eb113/29653658607.pdf
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c6e5e3ae332---roromubi.pdf
    • https://amatnieks.com/pictures/image/lowiri.pdf
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072f8f1a4a49---97095868650.pdf
    • http://pincailight.com/zk/UploadFile/file/2021062506184373499.pdf
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/rmq6sqf70ponfhvrb7c366erc5/tewexududizijodixed.pdf
    • https://ideylia.fr/uploads/file/toruruxeb.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=god+may+rest+his+soul+peace
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000143e6.bin
48ca940cafb28fdc6b9a383309dc4669bf85f2506e33abd3e310fa0dede6a422		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x143E6 26692 bytes
font_00_sfnt_off00011f0c.bin
4a0f6331e66d2779014b0e31ea8101111fbd227d340cf294de135936a731406b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F0C 3108 bytes
font_01_sfnt_off00012bd5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12BD5 16792 bytes
font_03_sfnt_off00017343.bin
5914d7eb97382593915bb3040931bd8d1b23c6795a68c86dd7231e96df724f58		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17343 10928 bytes
font_04_sfnt_off00018ca6.bin
36279aa501cab7e946f24976fba31b207d61bd367e1534aa1de34228951feb66		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18CA6 18588 bytes

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