Malicious PDF — malware analysis report

Static analysis result for SHA-256 6abae3631a92ecfe…

MALICIOUS

PDF

75.0 KB Created: 2021-09-05 18:21:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cdb4179ed3ac1b7294c706ee6a12daa8 SHA-1: c89d8040d7c3a35f2a91887652de104a9049971b SHA-256: 6abae3631a92ecfeedaaf39972447b8411c381b64aa55aa85d1ba728e2ee336d
156 Risk Score

Malware Insights

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

This PDF was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting domains, likely for phishing or malware distribution. The embedded URLs and the PDF structure strongly suggest an attempt to trick users into visiting these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

Heuristics 6

  • 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.
  • 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://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/pb3ganv66hcr3qie6aqm7rs115/75308940020.pdf
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/8bcf9d813bfba241c04a94369a3eccf4/20587099949.pdf
    • https://shoppingplanet.ro/ckfinder/userfiles/files/5296365702.pdf
    • https://bandai-k.com/userfiles/file/48591879698.pdf
    • http://rubivina.com/Images_upload/files/dolegexajegilirexadere.pdf
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a6fe63222fc---89937081869.pdf
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c660799dcaf---xopexavewilokolutigoso.pdf
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/31c405140a1f4cbb1744080a7ad9bdec/67266402167.pdf
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079907ec6eb0---nefujosenavidivi.pdf
    • https://nothingbutsafetyglasses.com/userfiles/file/67056732086.pdf
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160a07c7c7016e---5492191474.pdf
    • http://mpu-beratung-brendle.de/userfiles/file/28607475689.pdf
    • http://centroolosprato.it/userfiles/files/bibili.pdf
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/jh8s4gjd3aih1qt542oenjfbih/10896742767.pdf
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16092322a7491b---gifupupas.pdf
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a27b0178f7a---jototunobo.pdf
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608f78f369441---86089205211.pdf
    • http://akkoryazilim.com/userfiles/file/fupogarorinudutud.pdf
    • https://skvely-kup.cz/files/file/povigagalaja.pdf
    • http://angelojrobles.com/admin_initial_test/userfiles/file/zenejepagef.pdf
    • https://all-stage-meditation.tw/uploads/files/6100b1bde19c4.pdf
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16086ae5c354f5---sevonosebigufojoboxiviram.pdf
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607417cec1364---52807359078.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=jpg+jpeg+png+ou+pdf
    • 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_off0000b533.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB533 16792 bytes
font_01_sfnt_off0000cd40.bin
6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
pdf-font-stream PDF embedded font (sfnt) at offset 0xCD40 1680 bytes
font_02_sfnt_off0000d53d.bin
1d6a88cac280e3107364f9a0719546708707f318248d7e7283d6fe3493b24454
pdf-font-stream PDF embedded font (sfnt) at offset 0xD53D 10228 bytes
font_03_sfnt_off0000ec18.bin
78c41b0d0fbe02004ef59b803bd8a2bdc4e128318263df99ac91178c8fc911fe
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC18 19584 bytes