Malicious PDF — malware analysis report

Static analysis result for SHA-256 3770cec335454c20…

MALICIOUS

PDF

84.6 KB Created: 2021-07-05 22:00:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a5271303b50060b6c7298d2c7f666409 SHA-1: 6494f8eb3ec089b51422945b8b652e462edff37c SHA-256: 3770cec335454c202f7667c1c41890ce86ac5d44e5cf1ed3bb4cc64bb7014a2f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains a link farm pointing to compromised WordPress upload storage, suggesting it is used to host and distribute malicious files. The presence of a 'download button' heuristic further supports the attack pattern of luring users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/2e8af662c4a8c361e07098b194090d13/90337183096.pdf
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160708d1d2e3d9---rurumixa.pdf
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea3d9058f4---12846328507.pdf
    • https://handientu.vn/userfiles/file/lazusuwobisud.pdf
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/amrd2lnbnfdm7fv46sg7curh8i/vipugevoxerefaf.pdf
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/007b7a9f0a822ae29e1cb36498e4a7e5/lifux.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/5fmtg3ckn8qc803eiqs0nrr5i6/jemaxefulovome.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0763b623bc---32911751777.pdf
    • https://visionbrindes.com/admin/fckeditor/userfiles/file/wosubedupopuzobajafoto.pdf
    • https://study4student.com/cache/fck_files/file/sujetalisivorejaz.pdf
    • https://yz-yongzhong.com/upfiles/editor/files/85723874313.pdf
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/7f0927e538aeda872ab6d01c1cbdb2aa/vakinidobukavetonefew.pdf
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0237efa8e---12693701915.pdf
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16084fbdbaf038---magenojupalut.pdf
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/mp8upla1m4tm9i0pskk7u8g3gr/4327854372.pdf
    • https://nnkcreations.com/userfiles/file/11830927183.pdf
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a691619547---71018976455.pdf
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab5adf3149---dufadezinunaler.pdf
    • http://scottsdalehighbeavers1978.com/clients/80197/File/96230502876.pdf
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd91428a0f---83445046208.pdf
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/c6cc62fcffa5ff063c7f83edd9cb4d0f/zuxovaxewajonogus.pdf
    • http://harc-ias.vn/Images_upload/files/83406943518.pdf
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/sstk3kdcclki51m43i0a24pe35/joxopekuzosakuraguvoru.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=fda+previous+year+question+papers+with+answers
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cdf0.bin
780017138479f55a3882bd0583f2519ec6a0c014fcb88acb773604e03445b24b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCDF0 17400 bytes
font_01_sfnt_off0000e778.bin
09a205407957d8ee07027aae69433809deda68cdb48807855329478846dc69eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE778 16784 bytes
font_02_sfnt_off00011357.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11357 16792 bytes
font_03_sfnt_off00012b6e.bin
bf351c0beea790fd47c11eb77f61985401ab0a2752983b13d13d886392848476		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B6E 10932 bytes

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