Malicious PDF — malware analysis report

Static analysis result for SHA-256 2af336eb7bc288ca…

MALICIOUS

PDF

92.6 KB Created: 2021-07-08 02:21:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7e37627e0ebfa27bd9632df790190030 SHA-1: 9d06e3fdccb4d3952c3b3e8f27574e6cf1c5e6a4 SHA-256: 2af336eb7bc288cae44d686db1c9762683a85d372598e765021bdd0a56a45a05
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous links to external sites, many of which are hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of a link farm and the ML detection strongly suggest a phishing attempt to trick users into downloading further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://aimhc.com/userfiles/file/16146975604.pdf
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/4v4ufp5alvm7ue8g337qp2dlqj/tafepuxowuv.pdf
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/0705a1bd9161a83e228092ac0dbba417/dezojawelefokamodora.pdf
    • https://debcopharma.com/userfiles/file/bewetemagulekedewesaj.pdf
    • http://mvclassof1990.com/clients/8/8c/8ca0ba2c7a07c5cd1f21f9fc323c16c5/File/latidelukixanixazus.pdf
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16076a9b10aafe---solanixajanefevanezilak.pdf
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/kats06vcuql9nuto5amhqh79tb/80688688776.pdf
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b6730b1ad0c---kiradekelipedabufene.pdf
    • https://planet-for-events.de/userfiles/file/20171180946.pdf
    • http://bdn10.cz/files/file/63031686529.pdf
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160811db335c89---tipavoluwosemodofumil.pdf
    • https://ijmscr.com/ckfinder/userfiles/files/56523054908.pdf
    • https://alutat.com/data/file/48569357808.pdf
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075eb9fd983a---zerej.pdf
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609f7b94ac34a---kuxubuvaxa.pdf
    • http://perfekttorun.pl/pliki/87367587103.pdf
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16099c3e21c0a8---zozomo.pdf
    • http://giayviettri.com/img-ftec/files/desisab.pdf
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/3607ff871b74441da91fdc4e8353e55c/26205544106.pdf
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080d5f881fee---69589872436.pdf
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/cr3n1r8jhedi38f9m0bvj21q8h/kojawafagab.pdf
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/bd259b63fedfc48cf0ae94aec02c927c/63040946034.pdf
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16073c831a9adc---jijasomedamezebozokefa.pdf
    • http://ed-web.cz/userfilesfile/62546099582.pdf
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/94baedc94d1f568bacf5d1d60b34fc6b/gujobubufaniderogilutek.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=download+oxford+dictionary+apk
    • 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_off0000ee5a.bin
439f91fc52918ec11de7c10fc66f42d556e3ca0baf24f0cec7590a9fe4e8f18d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5A 16392 bytes
font_01_sfnt_off00010483.bin
1dcff6903eb1cb53ba4a69b6b1db91c34094259ee8bb712a4304602e41c3de8b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10483 18088 bytes
font_02_sfnt_off000133be.bin
82969cbb3f180135ed5fd430db230a61f67aa159df88a016cca774f6fab12b3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x133BE 10708 bytes
font_03_sfnt_off00014c84.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14C84 16792 bytes

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