Malicious PDF — malware analysis report

Static analysis result for SHA-256 b275318bd55ce0de…

MALICIOUS

PDF

84.7 KB Created: 2021-06-29 19:05:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e8d9d4cfc7d7e7c3857dff485578070e SHA-1: 437222ce24f2c241fa4145643bcd6799c58d93f2 SHA-256: b275318bd55ce0de49accab41c1ee59ce5c0dbe5b00f8df62ec8d5aeca3812c3
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress sites, many of which host other PDF files. The 'utm_term' parameter in one URL suggests a lure for downloading Minecraft. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfff6b95126---duvodojejixuvuki.pdf
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aec3b4ec79a---kizolamibab.pdf
    • http://bacsiha.com/public/ckfinder/userfiles/files/zijeteziwomuxomemufira.pdf
    • http://ricarda-allegra.de/userfiles/file/4193873656.pdf
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097e3bea242c---93927062096.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608764175ffce---sukowudez.pdf
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160afc360beea7---vabokiwepipesakamunu.pdf
    • http://ilkyoukais.com/Images/Media/files/16160223525.pdf
    • http://www.doctor-carpet.com/wp-content/plugins/super-forms/uploads/php/files/4mcfdrvpcvdoljjh2d7jmi4rj0/55137604138.pdf
    • http://learnazia.com/fck/imagesfile/80670755296.pdf
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/ebaub3vnka367equqg6ethemb2/barajefirat.pdf
    • http://msinziniering.com/userfiles/file/85743916377.pdf
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/12447c18ca47684015cb87917f448b5b/94610588212.pdf
    • http://mientaytourist.com/uploads/files/74259371232.pdf
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608d3ed926af4---38691511194.pdf
    • https://avgdesign.com/userfiles/file/45630691382.pdf
    • http://hzdsbg.com/uploadfile/1623398509.pdf
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f0131bcc4---tojemegetumiridebawixenab.pdf
    • http://ekotop.eu/userfiles/file/56618621215.pdf
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c56f0cd5eee---87347648877.pdf
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c309b269175---48149353374.pdf
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075f2b382f54---fexeg.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=download+minecraft+for+free+in+pc+windows+7
    • 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_off0000e8cf.bin
8012bfb6c5198e294b9e5f5d8a99303e28c6e9d942eeba568fc5011c3c6a20ec
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8CF 16676 bytes
font_01_sfnt_off000113d2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x113D2 16792 bytes
font_02_sfnt_off00012be9.bin
ac2646c669f9b39cabf43ae1a1a936e574882765ef9bf45d5fe4e8f449e2dc30
pdf-font-stream PDF embedded font (sfnt) at offset 0x12BE9 10916 bytes