Malicious PDF — malware analysis report

Static analysis result for SHA-256 a817758a10438592…

MALICIOUS

PDF

84.2 KB Created: 2021-06-28 04:17:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ece80038a69c5a113056fa248fc823e9 SHA-1: 8ca4c88596ffe85b8b0eb909c9a99117bc446a1b SHA-256: a817758a10438592c9ed8a754320f53e8271036eb706eb20ee009bd2968cff0d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/1194245db2e87b84bc56ffafacf14aec/36604835949.pdf
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/31c174a60da10ce4f70306d4def5519e/87226705174.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/vq2p050h31hre1s3eeie4gh9r0/batabigewibiriwuki.pdf
    • http://irinaburmistrova.ru/files/winigaxiximadekadodi.pdf
    • http://didocrosby.com/imagenes/file/wesixaripavevadarakib.pdf
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160a373609a710---33010417013.pdf
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/13e927841c092e8156e07a7517394b30/muxowifaxewijuba.pdf
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/9hekb9l9csashk5b3od8e94nku/nokibuwuxulubumew.pdf
    • http://hacoauto.vn/upload/files/lebipazimosen.pdf
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/5do8l0go2dmbevk6r6kk9ckqo3/jezugorirumigebo.pdf
    • http://hutbephottaihaiphong24h.com/upload/files/kusaliv.pdf
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/ee41fff7a4275bc500fbc828420d4ef6/bozon.pdf
    • http://beveragesgs.com/userfiles/file/42490029242.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070d6d3e9444---89085474239.pdf
    • https://bacninhonline.com/webroot/img/files/nifiko.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609a6ec558766---62056372230.pdf
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160983e84d145e---41125782682.pdf
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608da2f988c71---7293755182.pdf
    • http://skyrunarser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/2105260823533690512nggg5.pdf
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/19741814672.pdf
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/1e9fd524275a14cbf5996467f0a510d0/1958255219.pdf
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/1d24bb785b6556ad93b8bca1c2d746a8/70089531315.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=life+cycle+of+a+butterfly+with+days
    • 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_off0000e72b.bin
6f3607550a4424cc7ba8f064c4ca0963e60ed34587b998510a54e29dc44ab460
pdf-font-stream PDF embedded font (sfnt) at offset 0xE72B 16676 bytes
font_01_sfnt_off00011263.bin
4a7cb471689594258526d34eae18e3fd034343ab713b35cb57f647d1916d822a
pdf-font-stream PDF embedded font (sfnt) at offset 0x11263 10864 bytes
font_02_sfnt_off00012bb3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12BB3 16792 bytes