Malicious PDF — malware analysis report

Static analysis result for SHA-256 99fca58fda5f2739…

MALICIOUS

PDF

85.2 KB Created: 2021-06-27 14:12:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9658448e9b7442d534865690b298539b SHA-1: a587412ce1a9d0d82772f65c888c1d2b2a84821a SHA-256: 99fca58fda5f2739de234310dbfefeea48e2735c455789692204202341f53afd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links to external websites, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely serves to redirect the user to these malicious sites, potentially for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/3n0hbhb3p50kpaf63um56rejl2/57037617168.pdf
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609a704f439d4---70404259965.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/6366ipesb9l93ehbq0hjisa43r/papawisosivuvevekelu.pdf
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/0201021643a64bb156e2c4e0bc46ead4/bijepenimakopeg.pdf
    • http://abogadosaguilar.com/ckfinder/userfiles/files/walalixuforurido.pdf
    • http://carnow.jp/js/upload/files/jewev.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081ee73ea295---jorezozuroxufazezibubotaf.pdf
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/99ccb247beea77e02f2692c22d126f89/66475114996.pdf
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c2dd323d2---sonidimebiditiv.pdf
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/86bc46ebe90221dd7cb4fb4d13c2b7d8/goboneforibopiwasusuxof.pdf
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abd7f851259---tejasepatafonulanataj.pdf
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd2833f844---4402948201.pdf
    • https://gilbertems.com/videos/file/71802295103.pdf
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0429940234---bofatamupejibex.pdf
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c08341eca06---weribesazesuxikebujez.pdf
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/5689f261eda30655528a07a4bc53b0f6/2542686458.pdf
    • http://vhktn.at/images/content/files/11904218244.pdf
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160883d6ad2a71---dorupapakojaw.pdf
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/09dsom6891t4h7drm60k6dg4n6/53850560961.pdf
    • https://edu-mate.kr/_UploadFile/Images/file/40503834519.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/71962d196a35159d8c5487167fad2bc1/gevibelidenivutodewiro.pdf
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f08aac139a---nenuravusinurokuvokiwuxo.pdf
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/c1a2514cfb023d88470ba79e11c8d738/sopikabiv.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=replace+color+lightroom
    • 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_off0000e9d5.bin
d2918bde3645459b7a9f5057e517a27a9fd8cf48bdabd1be9ace1bab4415d5df
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D5 10592 bytes
font_01_sfnt_off00010202.bin
36cec3df2d9338e71c45aa9a024ee39caafe5ee81aa8bf96f8284c68c514614f
pdf-font-stream PDF embedded font (sfnt) at offset 0x10202 17368 bytes
font_02_sfnt_off00012f91.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F91 16792 bytes