Malicious PDF — malware analysis report

Static analysis result for SHA-256 06e59f3505cdeb4f…

MALICIOUS

PDF

74.9 KB Created: 2021-09-08 02:36:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9c5346fd3f8e24405a5e27be904023c4 SHA-1: 43346c0bcb11907fe0b67eaaf7698c0cf5270205 SHA-256: 06e59f3505cdeb4f0127abb9c96af89be6b3595df773f08f05c5bd80cd5243c9
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF structure itself does not contain readable content, but the heuristics strongly suggest a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://garglob.ru/uplcv?utm_term=gyro+repeater+lr40+manual PDF link annotation
    • http://xpressup.com/userfiles/file/piputozitusivofurukodib.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/55244833101.pdfIn PDF document text
    • https://bookatowncar.com/userfiles/file/rudalamagogavipafude.pdfIn PDF document text
    • http://wellfoto.cz/pictures/files/gemorikafadobe.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/49263002aa9fe1cc3bf5ad20d5a2d8f7/28996829188.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/gikogabi.pdfIn PDF document text
    • http://yejida.com/userfiles/file/metuxudijabituwatikedi.pdfIn PDF document text
    • https://embassyinvietnam.com/webroot/img/files/55820642904.pdfIn PDF document text
    • https://xn--80aaijzh9b.xn--90ae/documents/file/44028896056.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16233969750431.pdfIn PDF document text
    • https://successalpha.team/upload/files/2583898297.pdfIn PDF document text
    • http://geojeoceanhotel.com/userfiles/file/20210804180717.pdfIn PDF document text
    • http://haumeaonline.com/userfiles/file/62109915921.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c951a9386c---lexomafa.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/iqnu29lspk3191bgbcj32vpgbe/52794429859.pdfIn PDF document text
    • http://firstcuwire.com/file_media/file_image/file/lafuvuketuseg.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/49lku2jdc4a4637qulf28mvm04/fufiloxavobusiw.pdfIn PDF document text
    • http://cukrarnakolbaba.eu/obrazky/files/pekavike.pdfIn PDF document text
    • https://arket.io/wp-content/plugins/super-forms/uploads/php/files/ccb2pm580lpvhhefs0et418dn7/26045106192.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160778501b0be7---48727835828.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/bd224a5a5c5a7388883c93147c293d0f/wovudejiwuwumobesixuzez.pdfIn PDF document text
    • https://cissud.it/uploads/ck_editor/files/mudibareger.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/0f888f96828058cf0b11e17c719edb1c/47436509626.pdfIn PDF document text
    • http://sportsgarten.com/editorData/file/vewegijugasatujujad.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/fedisexafukunor.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/mdhfdhp24dstdqes9j5cf64nc7/gewopegu.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_off0000c041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC041 10608 bytes
SHA-256: 54fd6be62e65a190e4ac10afef76729db4cca169f1b83d49c75aee4d8d882b79
font_01_sfnt_off0000d88b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD88B 17456 bytes
SHA-256: 2543f9df48ec0d0f8b3ec7bbfa92f25b390eb6e2b649401505d8dd4dc5929654
font_02_sfnt_off000105fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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