Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bd93ac0345c4517…

MALICIOUS

PDF

105.7 KB Created: 2021-07-13 20:46:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d28e1f4ca5c663d70a1340441a309d6a SHA-1: e0d614f9aa6d8e672324ea5073c617fc3ad6ca8c SHA-256: 5bd93ac0345c451726e66eaf2b39d28ff7ea601178e433db363b1430f290f9d4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning model indicated a high probability of maliciousness. The document contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or phish users. Embedded JavaScript was also detected, which could be used to further exploit the user or redirect them.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9773

Heuristics 7

  • 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.
  • 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 http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/e288ff5dc63840e15a3c7615a000e878/masanoxi.pdf In PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/p5hoccrbb9pdp1fsumdnas9rvg/35608438656.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/ceddcaafedb6d03a752ef6ed793ba69a/gulujaxuzejefege.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/vozabox.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/e77d1921ceecfbccfb85608cdf05754c/63536163146.pdfIn PDF document text
    • https://warungmimpishio2.com/contents//files/88107705695.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/7cngl1mom5rh441egl4lekrrdr/43760932396.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/6b3ca57d6726b7289052df5952ad22e1/zusojomogunot.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/bdee06eb060e73f333c49c25cac08290/nudimabisoj.pdfIn PDF document text
    • http://ladakhtripmaker.com/userfiles/files/33313667457.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/vuzifafepewo.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/gdnt5umqdfv5ucde4iorqqv3gh/rodubegivofibuno.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/i60dsejmp7pckk10rq11bqdtpn/17336919664.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5c28b0e7d---47603993504.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/89fd15bf9ac2462ca9704c2fc393f308/59707069576.pdfIn PDF document text
    • http://kevinmcallisterlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fukumase.pdfIn PDF document text
    • https://dpt-mh.com/uploads/news/files/kewozoz.pdfIn PDF document text
    • http://ikuma-car.com/js/upload/files/9755705679.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/ed4516efac3dd9b949840d05b1167de0/78906023894.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9f1fe8b40---redaxesopexutuvaleb.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071262013090---nibijitin.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/76610863927.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607bfb8370160---sozepi.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/a6fpembu2peh92b8ck28usua32/lapaxifusilokira.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/1ac9abb6211e282e50ef4f449866ad22/gaguwezewaxerik.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160ab58bbd981b---13258023074.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/a06eead8558abc55b8177a931a5275c3/21554897988.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=special+topics+in+computer+science+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013b02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015319.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15319 10956 bytes
SHA-256: 6db07acff041bd07a6ba6ea8aa4ca8e06bd637d837e703702dcdfa02aaa1addf
font_02_sfnt_off00016c6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C6B 17068 bytes
SHA-256: 5042969b60c6dfffe135c4629785adcbb46afe9ac22de623a0e24da12446949d

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