Malicious PDF — malware analysis report

Static analysis result for SHA-256 57f72318487eb493…

MALICIOUS

PDF

92.1 KB Created: 2021-06-28 03:03:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 58a76ee68d8667a6b3b6c636a629108b SHA-1: d85a32f947637027755ec519fe612e13e1570b73 SHA-256: 57f72318487eb493da299697df8253cd8ae99786dd9caf9c8567321e6bcb64c4
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress upload directories and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The document body was unreadable, but the URL structure and heuristic firings strongly indicate a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/rv0644btuavvaumes7sspst4hp/60510426785.pdf
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608845cb47c12---rogatigifoteranaw.pdf
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d09089659b---buzakuzari.pdf
    • http://jirehenl.com/userfiles/file/121022295661.pdf
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccc2638cdc---36844480162.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5b306259e---38716093270.pdf
    • http://lafayetteconnections.com/clients/52818/File/87103971557.pdf
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/b090921b565c7e0795e11d1d7928ef69/vekejat.pdf
    • https://actorconseil.com/files/file/fuzamuv.pdf
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/ceaeae54cffab9c48f3b2fca40e32275/kefuxajuwujupatolekevopa.pdf
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/9d27fbedf03207e54e7ef3dac5155dd3/8396767708.pdf
    • https://aravlicraft.com/cmsCart//upload/file/pemidexagitidi.pdf
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3b1392794216215c64e686cf9c674bc6/zumeburaximo.pdf
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160766cedc1526---guratolipi.pdf
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b0b39d977---35184063736.pdf
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/jesehg3s0vq6pe69roh3sb9o15/31332054839.pdf
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/49f6058e1d6ae40796466f0b793bd78b/databowusekow.pdf
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/43n8cr1mmqq0i8al9nife4sjp3/88527703235.pdf
    • http://epoxidice.ro/mm/file/kagujazi.pdf
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/29884062b34a2b7c8edcb3e1981a6331/74126669662.pdf
    • http://ergo-logo-bamberg.de/userfiles/file/3577108520.pdf
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cac377dda9---mesarefa.pdf
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606d453e8c44d---25940946289.pdf
    • https://lexconsulting.ro/webroot/files/media/gipelejaranezanubudu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=a+metallic+oxide+soluble+in+excess+of+caustic+soda+solution
    • 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_off0000fbb7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB7 16792 bytes
font_01_sfnt_off000113ce.bin
0a1dc8e4e4afdf399ffeb20ade5c2aa0619b421e490806521d3c2e47e62605a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x113CE 10860 bytes
font_02_sfnt_off00012ce8.bin
ce36d04059e036bf2ccde559c2530ee0850749da1e7f0a8de24b70abb68a4b33		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12CE8 19976 bytes

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