Malicious PDF — malware analysis report

Static analysis result for SHA-256 eaedf85d9260fed1…

MALICIOUS

PDF

88.8 KB Created: 2021-09-21 03:28:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5efd95c81e3cf2e5210e7a537d488cab SHA-1: bbe50b555c66f81a2fde43d2af8566130e9dcbdf SHA-256: eaedf85d9260fed1523521a68c47905148adcf18cbab37831794b247db6538f2
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm pointing to compromised websites, and a machine learning classifier identified it as malicious. The ClamAV detection further confirms its malicious nature, specifically classifying it as a phishing trojan. The embedded URLs suggest an attempt to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://medvor.ru/uplcv?utm_term=android+emulator+win PDF link annotation
    • http://discus-rus.ru/upl/file/pamobeg.pdfIn PDF document text
    • http://giovanniseneca.eu/userfiles/files/nadusozujopekonin.pdfIn PDF document text
    • http://thietbikhachsanvinhhung1.com/upload/files/menewewulubupo.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/r7i93dd188j7cf136fg5pc01q7/82674478143.pdfIn PDF document text
    • http://w-w.cn/isee/pfm/cms/uploadfile/fck/file/72139512795.pdfIn PDF document text
    • http://ydis.kr/userfiles/file/191101333322.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/69487435039.pdfIn PDF document text
    • http://bamboomfi.com/htdocs/cljr/data/files/41975294097.pdfIn PDF document text
    • http://4x4autok.hu/userfiles/files/toridorufedexof.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/ffee7b1b5cca04c3e1620bbda541aa44/vewixofoxobebakaxebinuj.pdfIn PDF document text
    • https://speculatio.in/userfiles/file/71471026775.pdfIn PDF document text
    • http://hoadon-dientu.net/images/files/4714959135.pdfIn PDF document text
    • http://cs-golfclub.com/ckupload/files/medub.pdfIn PDF document text
    • http://aorganboys.handyfriendship.com/upload/files/43956364057.pdfIn PDF document text
    • http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/wubija.pdfIn PDF document text
    • http://www.afurg.com.br/assets/ckfinder/userfiles/files/mumakukezil.pdfIn PDF document text
    • http://noticiascgnews.com.br/ckfinder/userfiles/files/xufidovulagirupiketon.pdfIn PDF document text
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/970c52ea60c8ffc45863b7492f49e46e/51556116864.pdfIn PDF document text
    • https://careerroots.net/ckfinder/userfiles/files/54369252183.pdfIn PDF document text
    • https://jnnjhansi.com/userfiles/file/jiwibeworivagokukurinuvan.pdfIn PDF document text
    • http://pattarasawat.com/ckfinder/userfiles/files/68525901788.pdfIn PDF document text
    • https://kaemsp.org/upload/editor/file/64772623980.pdfIn PDF document text
    • https://plasy.com/uploads/file/70327989714.pdfIn PDF document text
    • http://vandervalk.reviews/app/webroot/files/userfiles/files/nixelezorubuvi.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_off0000f898.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF898 17536 bytes
SHA-256: 647acc49e9ad5d1f91c36d4c2d8f5fc3a73cc557baf6e4ffb8acf9a8c3722ea2
font_01_sfnt_off000125bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013dd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DD2 10408 bytes
SHA-256: 3b2d37ef5c0a903c430364158883ee3949bd04d0a448ade8772d253eff2433c0