Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6879ef0ee27c006…

MALICIOUS

PDF

82.7 KB Created: 2021-06-26 01:33:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 65a4314e8e4fb2940168663eeee8fa2d SHA-1: b171ddb45b4953dbc4720a7a4d430602f5d60a3a SHA-256: f6879ef0ee27c0063ef59f7d7414376905f1471ef6d0a950189a7f283dfb447c
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a link farm pointing to multiple compromised WordPress upload directories, suggesting an attempt to distribute further malicious content or redirect users to phishing sites. The presence of numerous unknown URLs hosted on potentially disposable domains reinforces the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e4457dd6f---29513146137.pdf
    • http://jump360.co/upload/files/20210614111216.pdf
    • https://666666.vn/upload/fck/file/barivisamodetizidun.pdf
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/6147076c31386b8a6771f8b8652fcf51/12199453865.pdf
    • https://oncetrabzon.com/resimler/files/31854444677.pdf
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/9fdf6e00248b6e110a21e022207c5324/3600914570.pdf
    • http://apluskleaning.com/admin/images/file/85482190457.pdf
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/dpai9tigfn0sm2q7bbqpa17tfj/xasikidal.pdf
    • https://kop-trans.pl/uploads/userfiles/files/xafusuwabitogurowuridel.pdf
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099ad9f773d7---pamitutabusogufur.pdf
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16080fa1ee9adb---78783437416.pdf
    • http://conflictfreeelectronics.com/ourprojects/chowki/UserFiles/renuka/file/pojob.pdf
    • https://likeevent.it/writable/public/userfiles/file/2429945874.pdf
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/18r6e8v08gnht2ghbiobib445j/vetaneburaxasudeber.pdf
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/zozamop.pdf
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/0a316d3adbed862a895c6c32d01c187e/36915995754.pdf
    • http://wildpflanzen-planung.de/file/52062076615.pdf
    • https://zzwgjx.com/d/files/jazireragizizowogeza.pdf
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/d3e5aqbbq7q0a9jk1bfbjfepin/80005962860.pdf
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/c24ea034ddfd70c670539ea3fea556bf/somimerulitosutu.pdf
    • https://stgeorgedentalcare.in/ckfinder/userfiles/files/97816208848.pdf
    • http://www.elstar.ru/uploads/files/5416717813.pdf
    • https://myphi.biz/nbloom/fckuploads/file/xofopijafosezivegufix.pdf
    • https://sonarmusic.hu/up_image/file/49514526063.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=history+of+mathematics+from+ancient+to+modern+times
    • 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_off0000df6e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF6E 16792 bytes
font_01_sfnt_off0000f780.bin
5d526ec3cf5191ff96046d96552aa087f1d07b1adb1103244f68f8f3b5aad810
pdf-font-stream PDF embedded font (sfnt) at offset 0xF780 17532 bytes
font_02_sfnt_off00012483.bin
545b3449909eb5959c306d3673b98b0de4247c95580c825224d199bbfc2bd4ec
pdf-font-stream PDF embedded font (sfnt) at offset 0x12483 10800 bytes