Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb2191b711d1a325…

MALICIOUS

PDF

82.0 KB Created: 2021-07-01 15:43:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8b452e446d8a9b0180d8b08b3606ce77 SHA-1: 13d7d030101e2c9ca13d23a8c45ae317f0b7240d SHA-256: eb2191b711d1a325f9e284e4f34755b4b4260d999e18c65eec61738bbddc3027
156 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The ML classifier also strongly indicated maliciousness. The presence of multiple links to external resources, some of which are hosted on compromised CMS platforms, indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b82f45faf---verakiduzo.pdf
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca9197243a---masema.pdf
    • http://miracleschoolministries.com/survey/userfiles/files/51881317168.pdf
    • https://2acontractor.it/images/file/mefibawajewit.pdf
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/6ldsn8ndot5te4pme3evbeenei/13538362923.pdf
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607719fa78558---pareduwinufibaful.pdf
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607caf346de76---nerakufuvugezavozojurape.pdf
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/55b0fbcb2db10e1c92193c5063a6ac58/43653519570.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/li5c7ndq4qt5c3scgtvk1hff0p/jometazedekebamo.pdf
    • http://daikinhbac.com/upload/files/64040581656.pdf
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609699d149558---xurikabitolof.pdf
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e405977e59---18933077720.pdf
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/061c80f09bdbb5e76da0ea4cdf05b94a/43996607031.pdf
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e45c03b513---juvedoxiv.pdf
    • http://csptech.net/admin/userfiles/file/sariwamiberofevezetaj.pdf
    • http://begemot-rus.com/uploadfiles/file/2021050302505973499.pdf
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/16097e5862481a---lemewaf.pdf
    • http://thrifty-uy.com/files/others/nesirikinuzimunuto.pdf
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/3446afcd76ee4a8f1ef31b74685b9aed/32457910680.pdf
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/761558e53299dd536a223aedea0000b4/jitanipowumanofo.pdf
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/8d825ab420470c1b85ea83421fecafe3/nudanulukaxupojuwubiti.pdf
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/28722877788.pdf
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/a5kajl4uefkb7c1g46ue2vqr17/likiwukutipebinonofatabi.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=download+vehicle+transfer+form
    • 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_off0000dda9.bin
e461a42d294be0c14c6b7f4eaa9e285f61d83b5ad0cc27c474caed41bde21169
pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA9 16896 bytes
font_01_sfnt_off000109a4.bin
ef8b8c9154277f7aa44b5cd645b10f513c2633cdc824307f1d775e560af873ad
pdf-font-stream PDF embedded font (sfnt) at offset 0x109A4 10892 bytes
font_02_sfnt_off000122b1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x122B1 16792 bytes