Malicious PDF — malware analysis report

Static analysis result for SHA-256 89ccbbf4e1abd37d…

MALICIOUS

PDF

171.8 KB Created: 2021-06-28 11:48:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: c313f53cf425a9ef770bf2c3e92aa3e9 SHA-1: 0248f4dece6656ba126a3aaf795a5da1b9eb234d SHA-256: 89ccbbf4e1abd37d09cf4e4f242af3550f1f4a9a9625b3c660977b85de42df4b
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous external URLs, many hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9428

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://ilcaminodaugo.it/file/49743121853.pdf In PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f84e53eef---xejomiduduvawivaritodabu.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/a0e750ff0e9ef96d650ab42e41ed6d27/6289901476.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/zisagavexed.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/qmck9lir3norrsh0t9d1k68ptm/63044290053.pdfIn PDF document text
    • https://sfeerweter.nl/userfiles/files/29943128920.pdfIn PDF document text
    • http://goref.ru/files/file/favobipuzidezirutowekiku.pdfIn PDF document text
    • http://chandigarhdatarecovery.com/files/file/20159974256.pdfIn PDF document text
    • http://arablift.net/userfiles/file/bedobozopiwo.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/a5737c55186dfdfc463606677bbcf828/41056616176.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210509055909.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/9d431d6686d28391aa1521ebf8d395f5/gositubogurolapokojexu.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/sijatujamapiredevibug.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607fae456cad3---89975734448.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/73qfe9uk4ptd0h5s82svakr8d3/kafobiw.pdfIn PDF document text
    • http://ildongwire.com/userfiles/file/tufuvafesoduli.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a03738b6fb5---seluna.pdfIn PDF document text
    • http://emilymillerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/95974692191.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/la2l68adrnfi4nmh1kjrutdbcs/57795272680.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa177e316b---42739898410.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/d4g4hp4teb4pdrenjb5hlc4g7v/58530220239.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/nuk2tn7o6oof2rsu7247n2nl0g/deduteniviriridukipen.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8fef5fcfd---pilafeguwu.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/0l5qq6ku6pu1h9ajfodp54ce9c/24338371068.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=use+plateau+in+a+sentencePDF link annotation
    • 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
font_00_sfnt_off00021d5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21D5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0002356d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2356D 16700 bytes
SHA-256: 584f154e8e9e383615a664de7d2c1a90ed57c612434ff8f20bb6ac4492a2d88a
font_02_sfnt_off00024d34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24D34 10252 bytes
SHA-256: 5811d8a6892b186c7bd7527f6750fbba8a9f58f3acf3083ba6f142f06f340185
font_03_sfnt_off00026456.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26456 1976 bytes
SHA-256: e682a3b837ca7fb7cac885ac52bd29c2f50d424b731991726d159844f50039f8
font_04_sfnt_off00026d5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26D5C 19636 bytes
SHA-256: 23f89253fda7e0cf24b7711d78ac3940bf2119a51d02f0920806c61950d915e5

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