Malicious PDF — malware analysis report

Static analysis result for SHA-256 90ecf6e9c93f745e…

MALICIOUS

PDF

101.8 KB Created: 2021-07-20 10:50:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: a522dc600891f0760a363cfa20df76f6 SHA-1: 0c2824c7d8cfe8b5c162251c2270dffb08227af9 SHA-256: 90ecf6e9c93f745ed6d2ad191bd17638247e0431da7d594fe12721cded10e6a3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

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
  • 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 http://bougerpourstarlight.com/clients/c/c6/c668404594a1c08d975ab50c7bec58f6/File/dobazapolejudubixuri.pdf In PDF document text
    • http://cioccolatogallucci.it/userfiles/file/27243084964.pdfIn PDF document text
    • http://novosib-sport.ru/ckfinder/userfiles/files/razuvobap.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/lukepimufubop.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f05d71b886---tuwuwiboliloborob.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/4230rcl4dj4li57cqhkj5okba6/bovusatovunilunenovunukin.pdfIn PDF document text
    • http://sewakendragroup.com/userfiles/file/vidorobigud.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e834c3510a8---zofegarerarodabizowa.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160933fb3de4b3---pelaxebifowaku.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160867ecf2d761---xoxisobakowikagidefolitej.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/3dliq2ovq37imlotjo4rot79v0/4415214257.pdfIn PDF document text
    • https://elbag.net/wp-content/plugins/super-forms/uploads/php/files/6d6d955957c3d47d3389cbc1b8fb3a92/nebigonoxemuvez.pdfIn PDF document text
    • https://nasikampung.info/contents//files/napusawowesipakipajivamax.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/dc8burevdqao1j21bc7g09t982/92849863199.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1e5e056d6---25235310303.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a9bd69893---17400176579.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/21339450836.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/34000059282.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/88901087375.pdfIn PDF document text
    • https://dimensionshoppe.com/alpha/ckfinder/userfiles/files/kefetazevuxaxif.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/c2273c802581f47bc73e313437d6d59a/zejozuwiwixu.pdfIn PDF document text
    • https://andhimazhai.com/images/files/33741877202.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/88453370476.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=northern+spotted+owl+populationPDF 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_off00012c80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14492 17268 bytes
SHA-256: fd6d238979589ef289b9b04e693173deb5b40fd750906235b57b80bf37509095
font_02_sfnt_off000171c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x171C1 10652 bytes
SHA-256: 55c7e2b670357feaf9f9ce683b235a46b262a37f4522ffc64a4fc5409aa816d4