Malicious PDF — malware analysis report

Static analysis result for SHA-256 8663b43169b335df…

MALICIOUS

PDF

84.8 KB Created: 2021-07-03 23:29:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: a26138b8333408c7ba443cdfa5418334 SHA-1: b1a4db80916692cd6a693aa17c652c35da4b489c SHA-256: 8663b43169b335dfde8e749a5d50b6d82e74900f33280cbb1e02a0cc56129dc1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating it likely contains an exploit. The file functions as a link farm, with numerous embedded URLs pointing to various websites, some of which are identified as compromised CMS uploads or hosted on disposable domains. This suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://travelinnsuites.com/nbloom/fckuploads/file/towazobokepuvo.pdf In PDF document text
    • http://mosjob.ru/images/file/87750645994.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160837efd38922---25510162494.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/519d036f7bb9fbab71fb29283e809481/47684085446.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1001635943---98934989923.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/1082b39dddd47f2d772e85e34252a1be/gezopupudorewegixoguni.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/04e23acfc97061f7b014b5c5b2dd2d18/77802172757.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608373f93d354---25800917167.pdfIn PDF document text
    • http://mertlakustika.cz/images/pages/file/39584380920.pdfIn PDF document text
    • https://mszukam.pl/dat//file/negilapibotegovupodaru.pdfIn PDF document text
    • http://urduhadith.org/survey/userfiles/files/95971981772.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-6-15/20210615030102890175.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a65cdbf1600---99073515225.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/e8262f0dc9e92eda13d90d7243e88a7d/64812087997.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de271658782---72905149516.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/tobumukedulizemogemibafis.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/o5nc89lj2of9svb8jatmofkbil/1730903246.pdfIn PDF document text
    • http://sanga.asia/userData/board/file/xavisiwinidivuvumanej.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/xidixovakuxuxaragimo.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/u1n94s1ftbcolnomncaeuilkie/dogaburiwobenenubiminobe.pdfIn PDF document text
    • https://diaochue.vn/userfiles/file/90732521208.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/a8rfacn9vp5ds17qdue4d0l2tn/88303737847.pdfIn PDF document text
    • http://bartuceviri.com/userfiles/file/zanejexasijipe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=angelina+jolie+and+cancerPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7b60a10eb0---39547465720.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9EB 10392 bytes
SHA-256: b5e80b5265a24f36e53e1885cf76aab6aa33c2a5e29ad61ad5fec57e7a9674cc
font_01_sfnt_off0001013b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1013B 17096 bytes
SHA-256: b65cd1a7428fcffabb61e19a5b5d3143d7e59be88311ccbe02fcc48c02160225
font_02_sfnt_off00012e10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1