Malicious PDF — malware analysis report

Static analysis result for SHA-256 c36e4ce4c557d45f…

MALICIOUS

PDF

80.7 KB Created: 2021-09-17 06:56:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7b9dbb0195eb5297bd6537d86c32e4a1 SHA-1: 9ab460cfb4a2abb368c61c3eb0acf3d722974fa5 SHA-256: c36e4ce4c557d45fdcb92fda97a2dce1454706d9aa61f19a14b8666a7947e663
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ylplj.com/ckfinder/userfiles/files/48105580614.pdf In PDF document text
    • http://kdbelektrotechniek.nl/uploads/file/jagojiridekosusobesupi.pdfIn PDF document text
    • http://nicolalazzarotto.com/userfiles/files/dosogavetijibedaraz.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/161305309323d5---vopuxeliduju.pdfIn PDF document text
    • http://myrbacken.se/login/ckfinder/userfiles/files/15224133203.pdfIn PDF document text
    • https://thegmsbihta.in/userfiles/file/90445072003.pdfIn PDF document text
    • http://wine-paraphernalia.com/files/winep/_repo/file/vufusokaxejezixiru.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/161386b26b1df0---tipafufon.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/52dd0857ef79e9d22688e7fc8004eef6/47965027391.pdfIn PDF document text
    • https://sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/zofumimated.pdfIn PDF document text
    • https://bizimpin.com/calisma2/files/uploads/bazabo.pdfIn PDF document text
    • https://www.theoakshealthcare.com/my_content/js/ckfinder/userfiles/files/50461669704.pdfIn PDF document text
    • http://hyosangjo.com/userfiles/file/20210917085416.pdfIn PDF document text
    • http://playbabydoll.com/userfiles/file/bijegobitipegujuso.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161334e173d8a9---71977467819.pdfIn PDF document text
    • http://tekizolasyon.com/ckfinder/userfiles/files/sutifemijubapebifu.pdfIn PDF document text
    • https://motiwalainstitutes.org/userfiles/file/rupofeji.pdfIn PDF document text
    • http://gerocuki.hu/user/file/zadukanulalol.pdfIn PDF document text
    • http://centrons.com/uploaded/file/6106215186134927ab3169.pdfIn PDF document text
    • http://vers-ma.de/userfiles/file/falesazakafeg.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/acf84833bbda8fab42fedd3bdcf1e210/viravapoze.pdfIn PDF document text
    • https://etevent.itweald.com/uploads/files/613f15aa7137e.pdfIn PDF document text
    • http://ngocminhcnc.com/demo_thietbimay_24_7/upload/files/fikowewuridejemu.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/21456969100.pdfIn PDF document text
    • http://domki-kopalino.pl/pliki/zinonadesaleretorul.pdfIn PDF document text
    • https://dm288.com/slicice/file/56797216022.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=brawlhalla+ios+controllerPDF 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_off0000d2d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D9 19368 bytes
SHA-256: 7804abe8fd3cb7f791d50a2c2d86338de35ae1cd15974b4640488de2016e9154
font_01_sfnt_off00010583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10583 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D9A 10464 bytes
SHA-256: 3e67cbd450c86457e967d3b23a5227f7c2b652d6d3fd5ea00d42f85ad4248144