Malicious PDF — malware analysis report

Static analysis result for SHA-256 54e1b1f7f3c18398…

MALICIOUS

PDF

99.1 KB Created: 2021-07-02 19:22:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 99d91710e91cec8347382ab052abe7aa SHA-1: 2496fee51b47f31fe591e18e11dd4b6107846685 SHA-256: 54e1b1f7f3c18398b78f05f9d8c770364d04081077c0f8742894f255bcf8c91f
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites used for hosting malicious PDFs. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded URLs suggests an attempt to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9839

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://crewmak.ru/uplcv?utm_term=the+grudge+2016 PDF link annotation
    • http://patronusalapitvany.hu/public_html/upload/17805753997.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16073474c212d4---76517278567.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/bafa9c93d4512a328afc7e6520378f21/vuvupegunoj.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6b6840710f---definip.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac053ee813c---gokobusuxas.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/e99d6c07eddb7747d5a19a4ed7d3dcf7/janiwuruwomevuw.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/70116305033.pdfIn PDF document text
    • http://dnepropress.net/files/file/putelepab.pdfIn PDF document text
    • https://ka-base.no/images_content/file/22688227457.pdfIn PDF document text
    • http://phongkhamducphuc.net/images/files/4290622473.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/kijapajar.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/c9ca9915422bfbf0d0ce7ed4ded9796a/waruzale.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/ffed2351a43f50691d64bc44848d1c6a/zusegexizuwam.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/11788333010.pdfIn PDF document text
    • https://fentesmakina.com/paket/upload/files/panawi.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/71261801865.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/uarioalfd1f4o35rcr6t0os3kr/6817168768.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/ts6ecus56k623epof5n02peb3v/sipegaxotadilu.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/d53dfed481f626c72ebed13fcee3eb9d/34736154036.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16085ff0cc8697---fujaropesesifel.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a556cbad978---40121552516.pdfIn PDF document text
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/3213223852.pdfIn PDF document text
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eaee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAEE 9900 bytes
SHA-256: 7aafb21dfbf25905338bd23fec9d0bb0921d61d6278779cbe9a4a4644df1886b
font_01_sfnt_off00010b29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B29 10260 bytes
SHA-256: 970a49da955ba5882622c9696cc2fa57ecf58a96f52e2c21af2ca9fdb23374b2
font_02_sfnt_off00012239.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12239 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013a4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A4A 16216 bytes
SHA-256: 8c2e9d80d580d08964a5048de7b59c27befd741f1c379efd0abbd599686b3e88
font_04_sfnt_off00014ff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FF3 17712 bytes
SHA-256: ff2627e60a35a69c07a95d1224d03bd9baf15664a3c85112d9b5a0b7c3ebfd86

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