Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7f1200d987b349b…

MALICIOUS

PDF

86.4 KB Created: 2021-07-01 10:37:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e113573faa9130f3151b0a3da72e17e5 SHA-1: 7729e94e54c96cd27b3e405a55c23f621e76595f SHA-256: b7f1200d987b349be29199d1ca9a1d9f90e0bdc3ba26d2ae86b14ab364f1bcad
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous distinct hosts, many of which are compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs are the primary indicators of compromise, facilitating redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/hqgqipga78n0236paofsfe218c/9966313904.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/4ji89so8ak5cqlga37i5v3grb7/76056166554.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075eb8b5b131---10163673293.pdf
    • http://aimic.com/userfiles/file/lutolamuz.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16070eb1c333e4---bopoloxusaxatirekadadozig.pdf
    • http://k1a.ru/images/files/file/tivuwezujed.pdf
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160850805996a5---pagexizanebil.pdf
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a625c422d5a---23818720282.pdf
    • http://anhuizhkj.com/upload_fck/file/2021-6-10/20210610142850523631.pdf
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a63043671b2---lenesizabupeluwolagit.pdf
    • https://ph2020.org/FCKeditor/file/terapekowuwokirok.pdf
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/qee1enca1dj8e3jd244gmncj23/51274123279.pdf
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/191ce3acee6c0d7432411f2463789818/22840284032.pdf
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606d38c4eea4f---68772371201.pdf
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f81859d467---96994941338.pdf
    • http://henrycrawfordreunion.com/clients/1/19/1929e20d1ffebcad6d8b2a659e9c170d/File/bififopuzo.pdf
    • http://aklond.com/UploadFilesfile///2021051209231278.pdf
    • http://tokstar.com/_UploadFile/Images/file/2705226010.pdf
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160915d7d699e5---polipilowetiropatojexi.pdf
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfd95f2f0d1---zerimigisoxikukusaferuba.pdf
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/ppdimej3qidif2p2hsn2cqkg13/26772123168.pdf
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/cvtics8vkkkf823ft3iquq14q5/veziz.pdf
    • http://matkinhantai.com/luutru/files/39971131838.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cadc144a212---51385846324.pdf
    • http://goraku-sangyo.com/userfiles/file/fijotitudumepofis.pdf
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606e66a119052---pevavirexove.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=bow+legged+one+year+old
    • 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_off0000f0a0.bin
9fc124b027fea195073fdec575a1a530ec58aceeef715cc1448305790098e35d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A0 10316 bytes
font_01_sfnt_off000107df.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107DF 16792 bytes
font_02_sfnt_off00011ff1.bin
abc88afcb61f57111a4b99ff64e9848823ab487a0d851efd16fad467fa8e5983		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF1 17192 bytes

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