Malicious PDF — malware analysis report

Static analysis result for SHA-256 44ba874527491ba6…

MALICIOUS

PDF

81.4 KB Created: 2021-09-15 21:02:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fe5ea7806a12d3135afba6375de7e213 SHA-1: a625b7d5cb838043e636f3c82ab1f9128044bb54 SHA-256: 44ba874527491ba654c5b0885fc637ecc5484d5926a96f3a8ca6a86cdf4da206
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://cructi.ru/uplcv?utm_term=best+android+sms+recovery PDF link annotation
    • http://daimarconstrucciones.com/images/admin/file/pixukokefoxenofoxexaka.pdfIn PDF document text
    • https://studioconcept-stand.com/fck_userfiles/file/63364515962.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/379cd3984c4e5c15a4cd824a98b9f9a9/25782713316.pdfIn PDF document text
    • http://onishi-kyosendo.jp/archive/duviwadiw.pdfIn PDF document text
    • http://pcserviszlin.cz/ckfinder/userfiles/files/10390904590.pdfIn PDF document text
    • http://divorce-difficile.fr/userfiles/file/nomijumuvegirudubibidodad.pdfIn PDF document text
    • https://nikunjfoundation.org/ckfinder/userfiles/files/74670107637.pdfIn PDF document text
    • http://iwilldoit.ru/uploads/files/files/jugawofabilemotizefe.pdfIn PDF document text
    • https://vrrc.heart.net.tw/ckfinder/ckfiles/files/14833869960.pdfIn PDF document text
    • http://ndc-group.ru/uploads/files/vumezugowerim.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/11047228658.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/riserurevolega.pdfIn PDF document text
    • https://banerjeetourspecial.in/ckfinder/userfiles/files/42521739532.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/962c95f1b97a4201665aace9259421ac/65070722031.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.com/userfiles/file/xarupenobi.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/4947005047.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/58845584202.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/abccef537d5382550245efd5541b5557/seredazijuvozos.pdfIn PDF document text
    • http://studiotecnicolari.it/userfiles/files/31782786840.pdfIn PDF document text
    • https://e-casainteligenta.ro/userfiles/file/63263661966.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/161383a15e9391---bunogamobaparizo.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_off0000d712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD712 10720 bytes
SHA-256: 87b8fb458c3dd0f59a105cd8e93bdb2c69f657da165c677e7c43b2307c98578f
font_01_sfnt_off0000efc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC6 18764 bytes
SHA-256: 32a6efeed3819f1eb22e02832fe01d632443f07f967beec4f2b78ca0af3817d5
font_02_sfnt_off00012036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12036 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1