Malicious PDF — malware analysis report

Static analysis result for SHA-256 032ba3deed50849b…

MALICIOUS

PDF

86.7 KB Created: 2021-07-12 23:17:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 17c7a8cc19e7e607a679256ec48f79d3 SHA-1: 6ec851cdfc833885b6fc90dc653fd8548f5befc0 SHA-256: 032ba3deed50849bc3b1da00163db30b561a7d6414d16d1ceb507a11604d2006
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs are likely used to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/73632daabd0d436e78e09f39ce9321e0/42102133537.pdf
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/mhq6kai8kmic6l2t0caljqprfd/lazasabugivuzi.pdf
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bd1518eba6---tegigaxoponinejoxu.pdf
    • http://quiltingacademy.info/fckeditor/userfiles/file/tilusujud.pdf
    • http://blessedfamilycovenant.org/clients/c/cb/cb727bc273eb4203dc66fb73741ae5ae/File/nuxubopive.pdf
    • http://hagelkonzept.de/userfiles/file/76885192473.pdf
    • http://bpabv.nl/uploadfiles/file/vepojivixiwuraxo.pdf
    • http://growlink.biz/userfiles/file/17976008810.pdf
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078149ba4040---8060297303.pdf
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/608a3ad806f9b37b21ed0915ff09a7a3/22188110109.pdf
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/99d0dd52250ed51665cd58e55d024abd/gakexofaxetaka.pdf
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1609c1e189f9ce---zajulejiwuvakilisobefe.pdf
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da7e0ac32ec---selax.pdf
    • http://sunrui-ti.com/d/files/togifirobuzamimopufidor.pdf
    • https://mariellatriolo.it/public/file/3948182798.pdf
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ada88dc2e2f---45683212060.pdf
    • https://charterfori.ir/basefile/charterforiir/files/57087704558.pdf
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/i3amtie1ptmcasml300vhohoi7/sutebe.pdf
    • http://hvpeds.com/upload/contents/file/suzadegotigiwilakud.pdf
    • http://bobmeetin.com/media/galleries/files/luwukileperesalepo.pdf
    • http://tort-art.ru/userfiles/file/85982106007.pdf
    • https://nakipoglugroup.com/upload/ckfinder/files/tunituxutax.pdf
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/7fc687bf10b389b906ed6898f1675520/7555570759.pdf
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d9a437678a5---58991011540.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=construction+daily+progress+report
    • 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_off0000ee21.bin
526aa75f660b0ef872937670130e6752fe9a4edabda40c26d4c1160ccf42f88f
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE21 10936 bytes
font_01_sfnt_off00010775.bin
85ee9e038254f681595bf74e73588c2ab31aad398d9f0f1ce3bed1af7e56096f
pdf-font-stream PDF embedded font (sfnt) at offset 0x10775 17584 bytes
font_02_sfnt_off0001354e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1354E 16792 bytes