Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a8ba11b3aa75da4…

MALICIOUS

PDF

85.4 KB Created: 2021-08-08 12:42:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4020740186d08a97e40c221a2d061d7e SHA-1: c3b7ca5328dc757de0537b224a67604dc4e17cfa SHA-256: 8a8ba11b3aa75da49d3fed6851ec5a249fe7fd51915419a7eca42adde6830954
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic findings and URL analysis are sufficient to determine its function as a malicious redirection mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098cdb54d6ae---mudigofazikilopojepedu.pdf In PDF document text
    • http://snap-drone.com/userfiles/file/12283902591.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/64362805.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/toguzif.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1606d805025ef3---94986357989.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098aad01771b---51386462523.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/77172073826.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/9615a3b6afcbf04088c9647ed8559047/tisosi.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/sugejiwazebogetexuvobonib.pdfIn PDF document text
    • https://hssanesteban.cl/files/rokofazin.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/gujoxikupodupubower.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/166f9bbf41ec4bca273e77564116ba0e/87289079422.pdfIn PDF document text
    • http://kup-vino.cz/web/ckfinder/userfiles/files/birifuxir.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/botajudedobelus.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/2fe5ad9eef5587562bce12016f869f86/41353395519.pdfIn PDF document text
    • http://hanlacsclub.com/ckupload/files/pababudutiwewunubatiteno.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c56d0a1c9f8---wisapowux.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/c2ebc5341c4cf6992e67c3c0e3c5f00c/91288930410.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/2ed0dcacef5a2d8083ef8c66b346a550/14392506462.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/gowetatu.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/wekebedopukuroxigosovefen.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9cf9bd026---daxafojotixebixaf.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099f4e5c6e65---nitijanotaluseno.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=lg+ac+error+code+ch+02PDF 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_off0000ea58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA58 10340 bytes
SHA-256: 6596b57774e3fbf9987d30f2d4d319760fd1b08ee517dd72c3783779767e50bc
font_01_sfnt_off00010198.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10198 17204 bytes
SHA-256: 029ef8b0ced342b7756ce8562f194edef0a5f0cc76420160db8c27b7ba593d14
font_02_sfnt_off00012da7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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