Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcff4cd043faba74…

MALICIOUS

PDF

85.3 KB Created: 2021-06-26 23:09:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 405c4a3a0229586f2a776dcbb2b6cdc9 SHA-1: d586241c6090f4daa32abd62f392c10ba4795616 SHA-256: fcff4cd043faba74ec2e2c89bc89cedc80a2515392ce38396011f185aac48054
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links pointing to other PDFs hosted on compromised WordPress sites, indicating a link farm designed for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent. Although no scripts were directly extracted, the structure and URL patterns are consistent with malicious PDF droppers.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2acf4fce7---15805388827.pdf
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/fd98bd17f5f54f076b4911ad01e34c78/nurulevujepilaserejomi.pdf
    • http://progfin.pl/userfiles/file/71863199417.pdf
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0ed7bf458---wulukesariraxafosojonika.pdf
    • https://planet-for-events.de/userfiles/file/48093870101.pdf
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608340fe3b75e---turulunewiza.pdf
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/2ce22be6dc2ecdd335b20b3d716561d2/numelulu.pdf
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070580b52bde---jupawazulabukuwig.pdf
    • http://ankaser.com/userfiles/file/84064741003.pdf
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/rdrfcdt05pusvrusfn00i6ttbi/30307135051.pdf
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608094105fef5---viderogosuka.pdf
    • http://aplus.to/userfiles/file/kesemazirizolikebuzitudut.pdf
    • https://villanakarin.com/userfiles/files/lusuxeludetetugaxix.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ae2c0e22c65---49208101428.pdf
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/0ed6ad55b6450916711b491f2dceb56f/18029409088.pdf
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb6df484226---36731564850.pdf
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8a7ebcfad---gokututemidivedusoviwig.pdf
    • https://elbag.net/wp-content/plugins/super-forms/uploads/php/files/adfaad32ff59395f4af31722d6e45087/27190856522.pdf
    • http://bsp-oblspl.org/ckfinder/userfiles/files/somudamis.pdf
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160c8de6ca4a41---44345799812.pdf
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160796dc09a291---safadotazefipixulumiv.pdf
    • https://anukulagrotech.com/userfiles/file/35725581803.pdf
    • http://augustaelectricalwork.com/editorData/file/41454046002.pdf
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16082a78e08e0b---98221542585.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944ee15c84c---bepogatebopebomupagemalix.pdf
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/99822123ea95508255d22035fd89a684/71078177267.pdf
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/013c7c126d019b8bc061e330988d7c19/jogitasim.pdf
    • http://chixue.com/uploadfile/file/20210624085859.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=independent+variable+and+dependent+variable+in+science
    • 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_off0000ebf6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF6 16792 bytes
font_01_sfnt_off00010408.bin
09a91126ebdc9fd8498d45a8d9050623c84b1d3862285bcf85d71556e5f9f494		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10408 16744 bytes
font_02_sfnt_off00012f4a.bin
ab79905880d2a172acb3ddc15cf7bf880cf893df013b03281a7063ce5a76d752		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12F4A 10544 bytes

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