Malicious PDF — malware analysis report

Static analysis result for SHA-256 561dfa3406c784c8…

MALICIOUS

PDF

225.8 KB Created: 2021-07-14 07:55:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 075599512b2c3cb50f83adb36e285117 SHA-1: 127740ae97bdd48ade3d824bc181952549b01c19 SHA-256: 561dfa3406c784c8067f1c48d4c78114d717d38c1ef9ac3d832b199b59829c43
166 Risk Score

Malware Insights

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

The PDF document contains a link farm that redirects to multiple compromised WordPress upload storage locations, indicating a phishing or malicious content distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the presence of PDF link farms and compromised CMS uploads points towards a phishing lure designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9571

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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.
  • 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://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3e9a55c7d---51460446162.pdf In PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/f8af2e45aee1d31298b193da7a3f8bcb/bipezu.pdfIn PDF document text
    • https://p99.tw/pro_pic/files/kaxukazovudar.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c20ee6e2a70---93434948394.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/51523921838.pdfIn PDF document text
    • http://metallpress.ru/files/wojududekekudalutigonizil.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/b1dc3418913e98ac400c2e2659fbb5aa/71680029263.pdfIn PDF document text
    • http://mcutech.net/files/10019549876.pdfIn PDF document text
    • http://dnepropress.net/files/file/wekuf.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/0b2f74394d1d3b1cf1c0acbbd634120d/zatex.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/64836291152.pdfIn PDF document text
    • http://olversonfamilyreunion.org/clients/5/51/51a48c89da211807e19ed56f8a1a1822/File/43996643467.pdfIn PDF document text
    • http://americanpetrochemicals.com/customers/CMS-IMAGES/file/sidotifirinurowowot.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160855c1ca3fab---10016956206.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/1920b9ec0b5070ab23876cb60e555026/80953320970.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b8887e01d12---kotanijegunuvarunetuboku.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/14789593958.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1609915a380c0d---87038830034.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/f31f91df0797b8974a43ad3ad974cf33/lipopoxipoza.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072a3130962f---98608686922.pdfIn PDF document text
    • http://tencanpowder.com/d/files/78051819276.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/8e2719db6b110943ec64bee346624ff8/vubutonokotavase.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083c9d01c63e---sitevojibom.pdfIn PDF document text
    • http://falconfam.com/ckfinder/userfiles/files/88448779571.pdfIn PDF document text
    • https://wsbtitan.com/images/file/fogikewugowuzev.pdfIn PDF document text
    • http://safarang.com/basefile/files/40275187893.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/c95c5cf2bd10e41c132309a82060a669/dolokupuvapanomawopubo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=javascript+date+string+formatPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0002ff8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FF8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0003179e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3179E 24436 bytes
SHA-256: d48f619218ceaafde8e05a6fad438b749e7cf471890f0d54f6be4ed4de7af2e7
font_02_sfnt_off00035500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x35500 2268 bytes
SHA-256: d20e2283392dccf3ee170041190baf05e0f0702da880230f1ac2c584917e3fff
font_03_sfnt_off00035ef6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x35EF6 10976 bytes
SHA-256: be1b69c7e050d862fdf69aed1ff82978fb91654ffe76e4679c9e74c41d7baa71