Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9bc2fad8b21b651…

MALICIOUS

PDF

101.3 KB Created: 2021-07-02 19:35:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 194878c47f092a0c041ca6c37cb16a14 SHA-1: 51d0eecb0777c0c5d134adb6100ceb65636faf3a SHA-256: b9bc2fad8b21b65151a62a4154f7d2affaafe2cd0bf8388f7a89b980b263aa8d
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to compromised WordPress sites, a common tactic for phishing or distributing malware. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The embedded URLs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9737

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 http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1608323f3e3dc2---41575183189.pdf In PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b23e320cf7c---javerasipibemegezawulaka.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/dl8rouqsutvqau1eu6unluv7fb/12747257135.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/b7b9cc3d231eb3cd0c78de02714b0da7/85723460541.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2b137c63b---13718066794.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/jik8csqa5k264k5q7me281ogc0/koterumisafar.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160decd6ae008f---97899761838.pdfIn PDF document text
    • http://hopkinshigh1988.com/clients/75739/File/17197435180.pdfIn PDF document text
    • http://thaoduocvn.com/userfiles/image/file/90276467518.pdfIn PDF document text
    • https://hgb.se/filer/file/34732281615.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/kuwojuwe.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070990931184---ronulumusufolexowat.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/1bc9ee511a2bc9d9b3f7f21e80d7f78c/60509953755.pdfIn PDF document text
    • http://suachuaspa.com/upload/images-content/files/11762686549.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/6lnn79hafet0d803npkgcufali/22229814731.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/vpt1fvjreg2svlbvtr85605h7v/mimaxiwiwuk.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/fbcd484222e86d8f11956dc47c6de0e9/71841999464.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/132c2e10f75c511c6e337c534b5b623d/rupipawekefefamopube.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cdb2f0513f2---sizilozonigiku.pdfIn PDF document text
    • https://emmaushuis.org/pages/92281979263.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/94525146729.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/1e083a9b5e75a3b241dfe453fe540d86/3336806520.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=hedonism+meaning+in+teluguPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/f8bfbaf3f0d852a305f23590e6ff24a6/jegovugek.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00010c05.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10C05 18328 bytes
SHA-256: d9f5e66163d907df9b2c2f031b8906ab183602eda4757f3e8ef428a9cf922d60
font_00_sfnt_off0000e67e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE67E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8B 3464 bytes
SHA-256: a8161c2f5ba9235eb51b4fcc43b6bb219725019365cb8d38f9ec25dfe5ce54ff
font_03_sfnt_off000129a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129A2 27368 bytes
SHA-256: faa11470ea42723947373786d4106d37189137ed2925f8959367e71d4ef4b455
font_04_sfnt_off00016d53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D53 10580 bytes
SHA-256: 015360750f9678769cf0ac71988d32caa69a58b54b0bed6c359ae6c5df184641

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