Malicious PDF — malware analysis report

Static analysis result for SHA-256 68ae833e551a7f2b…

MALICIOUS

PDF

82.0 KB Created: 2021-09-18 18:37:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 03035633a237b576838e145cd4db4452 SHA-1: b2e4bc0a6e1e05cfddaed7a6148913d33abe8d80 SHA-256: 68ae833e551a7f2b3c8af51968cd1326363a416be20e19c56df85bf33353e2da
196 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of 'utm_term' parameters in some URLs indicates an attempt to track user engagement with these lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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=how+to+get+more+storage+on+android+tablet PDF link annotation
    • http://perfect-gallery.com/userfiles/file/vudagukejezinuguke.pdfIn PDF document text
    • http://www.benyowsky.com/resources/files/poniberewimejadofutawuw.pdfIn PDF document text
    • https://golf-tout-terrain.com/publish/page/file/69179014072.pdfIn PDF document text
    • http://cu-hinothai.com/ckfinder/userfiles/files/97952151068.pdfIn PDF document text
    • http://webinaris.training/ckfinder/userfiles/publics/files/21247295479.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614045a72311f---tepigoselijutapajafoputej.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613304a6b2625---nuzosopijum.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/f211b7e80df0e39ad1863fb93ae1c16b/96502700247.pdfIn PDF document text
    • http://chinalabware.net/d/files/30986100738.pdfIn PDF document text
    • http://myrbacken.se/login/ckfinder/userfiles/files/20976690623.pdfIn PDF document text
    • http://playbabydoll.com/userfiles/file/golawiluxunekeki.pdfIn PDF document text
    • http://fewo-spreewald-schoetzigk.de/brandenburgtag/img/editor/file/67802089393.pdfIn PDF document text
    • https://designmaster.in/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/40139062233.pdfIn PDF document text
    • http://sakem.org/userfiles/files/48008457049.pdfIn PDF document text
    • https://ladangmimpi2.com/contents/files/67756870549.pdfIn PDF document text
    • http://odessawa.com/userfiles/file/zedivoteginuves.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/nenabowoxa.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/16142bb61031f0---lozinibovizobal.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/0ouuf11uabh82cqb4qd2e0cd3j/nakimotipivexipatafave.pdfIn PDF document text
    • http://nikolabartakova.cz/files/file/borulotuxitidemimitade.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/dukajidonozoda.pdfIn PDF document text
    • http://oikoscoccatoarchitettura.com/userfiles/files/15947526688.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/33725665023.pdfIn macro / runtime command snippet
    • http://eprdel.cz/userfiles/file/xejafosupuwilotefadabin.pdfIn PDF document text
    • http://oikoscoccatoaIn macro / runtime command snippet
    • 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_off0000dca9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BB 17544 bytes
SHA-256: e8acf0541184d40425333d476c3a8242f2c48d603fc1c5bb0f4181223d4f84f6
font_02_sfnt_off000121d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121D4 10808 bytes
SHA-256: d91beee78ec6674820eab386d47880133fcde241d8392c4c146c4b01b65f4eb2

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