Malicious PDF — malware analysis report

Static analysis result for SHA-256 d57d850ae3927e4c…

MALICIOUS

PDF

86.8 KB Created: 2021-07-25 21:26:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0f721fc2e6456e77deb5f8066e87c9dd SHA-1: fed3adf8497ef961d3cf4c219ea0a5b515c1c8d1 SHA-256: d57d850ae3927e4c7eb19b438d67c6625e28dfb8f8ce187c518653d6d15a159c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for executing malicious code within PDF documents. It also features a link farm pointing to compromised websites, likely intended to lure users into downloading further malicious content or submitting sensitive information. The ClamAV detection and ML classifier strongly indicate malicious intent, consistent with phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://markzone.az/wp-content/plugins/super-forms/uploads/php/files/bi8t6qdbf2nh843sqa555b67iq/xatozidudifejirukudex.pdf
    • http://educationexplosion.com/clients/a/aa/aae59ec6301d25964842a0067e0ae100/File/dujadoxirakor.pdf
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e036e10b083---nuzogumopagevuzaxisa.pdf
    • http://olympiad-bigben.ru/ckfinder/userfiles/files/sepajofajege.pdf
    • https://dancleland.com/img/upload/file/wumis.pdf
    • http://archinfo.ru/uploads/file/741528051.pdf
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c87ef245d29---liriwi.pdf
    • http://eko-inwest.eu/upload/file/jobanafekapisujetineluw.pdf
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/13151bff5d5d9fa3b8e23c53537a53fe/sokipat.pdf
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1003d01b54---defulujowasapijiwozuxuvi.pdf
    • http://illinoislivestock.org/userfiles/file/75037529636.pdf
    • http://fitnessklub-impuls.pl/uploads/assets/file/85458372405.pdf
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/3fc5fu4eqpqlu5a00kral72l88/8404511110.pdf
    • https://xo-sound.ru/userfiles/file/wosizijotaxatasizuz.pdf
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/077d041c6c4c442f6c75f2a2b7d2d6b7/wumajekeb.pdf
    • http://cpbnatation.fr/fckeditor/userfiles/file/8834154438.pdf
    • http://meyergarden.com/ckfinder/userfiles/files/96409900677.pdf
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/dfd85652eb4f33cf4276b24c44b4d51a/89172623825.pdf
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/37be311b874950e2724fd154be4e6d5c/zeraxapuforosufepom.pdf
    • http://devison-matras.com/upload/file/15433723589.pdf
    • http://quaint-house.com/15861531296.pdf
    • http://scarpatti.com/files/wuxefibowoxig.pdf
    • https://imad0c0.com/js/ckfinder/userfiles/files/72314590419.pdf
    • http://alliance-ltd.com/userfiles/99355682478.pdf
    • http://sumterhigh89.com/clients/863574/File/27405896869.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=symbols+in+romeo+and+juliet+act+2+scene+4
    • 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_off0000ef01.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF01 16792 bytes
font_01_sfnt_off00010718.bin
d201c13de56810cb8873bba55eb082dc91b958fd9fe38a2b96b094f2b72b0552
pdf-font-stream PDF embedded font (sfnt) at offset 0x10718 11288 bytes
font_02_sfnt_off000121a2.bin
d0d96f01227206381facda1646cfb434aabb8570f48aa6238b4be51d4a795120
pdf-font-stream PDF embedded font (sfnt) at offset 0x121A2 16664 bytes