Malicious PDF — malware analysis report

Static analysis result for SHA-256 4288a720ac40ecb1…

MALICIOUS

PDF

94.3 KB Created: 2021-09-07 07:12:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4a116cf587b7b2241af77ef4b90d6100 SHA-1: 12f09f7fcfde6c59df2838e79c4dafddee5f43d2 SHA-256: 4288a720ac40ecb13a9784e831501843521522aeb1fffa4a754317c8653caa2b
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV with a 'Pdf.Phishing.Trojan' signature. Static analysis revealed numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The presence of these links suggests the primary goal is to direct users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3379

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 https://archism.ru/uplcv?utm_term=my+brain+on+fire+pdf PDF link annotation
    • http://al-bandak.com/userfiles/file/87208647208.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b29090c29f6---25390802315.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/pizedegubukite.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608ccf58d90a9---duvasixiwudifukopifug.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/ruvux.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/u1lcn7gksmnq5399a9k9tgb4s6/66353473834.pdfIn PDF document text
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sejebikutidunulob.pdfIn PDF document text
    • http://perilatomsk.ru/ckfinder/userfiles/files/73869537690.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607feafc44d2c---zedibebajalijok.pdfIn PDF document text
    • http://lookkorea.net/userfiles/file/27396779514.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160706ed1e81b6---26407032632.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608427b36079a---dosiduvejavewanuwagetipor.pdfIn PDF document text
    • http://pahsclassof2005.com/clients/d/d6/d61c4c031b0f3af13d3e88110ef3a3e1/File/gukubo.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/36756326150.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202105/file/1620777297.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/10321873454.pdfIn PDF document text
    • http://www.hussco-steel.com/husscofiles/files/45896384466.pdfIn PDF document text
    • https://areicon.com/images/file/57579454923.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa8ca26d7d---74845372040.pdfIn PDF document text
    • http://archerelectricsupply.com/userfiles/file/32620787507.pdfIn PDF document text
    • https://wfbulgaria.com/uploads/wysiwyg/files/wakometedikot.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606efd63a194e---milopefekinakebikozodajo.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/wanisotekinexegiwe.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/53c6750260cf030976d5d4aac39d1edd/sodurejor.pdfIn PDF document text
    • http://prefinancovaniehypoteky.sk/res/file/97349380962.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011300.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11300 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012b17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B17 10428 bytes
SHA-256: 30f81ed6b18e777c0bf8a08a3637ce0cd090294feeea7a8141fab58f67eefa73
font_02_sfnt_off00014295.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14295 19004 bytes
SHA-256: 83674a59ed7d46b34f9aee43d3599585c9cc6c24e84132b4a6cd21b2c885b104

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