Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9f5c114e15597d1…

MALICIOUS

PDF

83.5 KB Created: 2021-06-29 02:43:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5538eb0e72744416f455228934fb4418 SHA-1: a9b60beda44dc36c5872c2c781b2292576bf63c6 SHA-256: f9f5c114e15597d1b2e46f33cbe1c0aa8231cb16c787f4ae084145f414d1d4d5
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to potentially compromised WordPress sites hosting PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution by luring users to download files from these links. The document body is heavily obfuscated and unreadable, providing no direct user-facing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc8e174ef6---85388401973.pdf
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607670adbcd6b---79884723411.pdf
    • http://diplomat2014.ru/ckfinder/userfiles/files/88734648018.pdf
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7105950d5---5565236766.pdf
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/4to1n77pbsqd4ddq7n5n4874j2/bovobuw.pdf
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/apgg4h2m2h5gtmq136p4flln59/guxoxulizopezalu.pdf
    • http://www.advokat.com/app/webroot/img/fck/file/dumadim.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/7cfe59c6e050e221b6fb5ad572f6f6a4/gasiwas.pdf
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/5jlmm44n3548s6gmsv2sl9p1g3/44154204036.pdf
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160babe1ac1aa7---63914049313.pdf
    • https://zoldlepes.hu/userfiles/file/tiranuvuvetatitafekotuta.pdf
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077f351e1766---xenam.pdf
    • http://sacoorhealth.pt/site/upload/file/zaxukokuxa.pdf
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c88e55e5ea5---bebolepixososuf.pdf
    • http://elcampoeco.org/FCKeditor/file/18929347716.pdf
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c469acccd8a---dulavixis.pdf
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/mb1ac6dqfv7fsuu6ossnd9g1ih/16448831379.pdf
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/5b133f4526faee7aa160873e6894d050/17018368046.pdf
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/hc6nfoh69i9rftgkbmudfpmklk/busodewilarurusosutan.pdf
    • https://kimtuong.vn/isc/public/files/fckupload/file/gedosovavegabud.pdf
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f672577f56---3630102471.pdf
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/391c5951982e020bd30ccda348571f12/90981531113.pdf
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b589eb10b86---nafidip.pdf
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b08fb25d731---zonoveluj.pdf
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/e82bf965fb040b4e5473c74366cb7ce6/14559426419.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=ps3+download+only+games
    • 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_off0000e3c7.bin
a7d35f80f4296f0116f09d8499fccdfdf47ba3c4e33ae8c5a24f05905517acb2
pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C7 10672 bytes
font_01_sfnt_off0000fc22.bin
1752a74ff7dfe9fa18397009469d8a56ce02c054185c1dbd660ea096e8e33532
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC22 17116 bytes
font_02_sfnt_off0001289a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1289A 16792 bytes