Malicious PDF — malware analysis report

Static analysis result for SHA-256 3363f1028cd3d06f…

MALICIOUS

PDF

80.4 KB Created: 2021-08-02 16:00:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: bd43353a2d1bd232e7f1aafb6c7d7107 SHA-1: ae693efafa43e8029515e5f0da7b7e2635b7f1f6 SHA-256: 3363f1028cd3d06ffa0aaf8436d3ca970e7e1670bea1eb90905aace969167254
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://krisoc.ru/uplcv?utm_term=impresora+hp+deskjet+f4480+cartuchos+compatibles PDF link annotation
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/sk7j09ef1kjofb89pmhiu713qo/20775164259.pdfIn PDF document text
    • https://netiko.ge/img/Data/file/bakirom.pdfIn PDF document text
    • https://presstone.hu/userfiles/file/masune.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/32752335922.pdfIn PDF document text
    • https://growyourmoney.in/userfiles/files/43830595487.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160809935666b7---13769118123.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d66ea2ac487---nusazokadunubajipabebegi.pdfIn PDF document text
    • https://aalatour.com/basefile/b2caalatourcom/files/zumixebupifujob.pdfIn PDF document text
    • https://sealordhotels.com/ckfinder/userfiles/files/61912815331.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/ah1qr2gd7u6i9n4dkh7p7dj045/xaposokexegefeto.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c756a747e06---77761860858.pdfIn PDF document text
    • http://wphs69.com/clients/1/13/13dd0a1135c99f886ff4006aa3c820ba/File/xoluxatiru.pdfIn PDF document text
    • http://highlandlynxotic.com/clients/7/73/73cf6ae24f8ea70eb1cbac1dff6b0f9e/File/28180124122.pdfIn PDF document text
    • https://sailstudy.in/ckfinder/userfiles/files/negabudezi.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/9275dacff1b68b34492eda04a115f6dc/56917848489.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/xifuwi.pdfIn PDF document text
    • http://salkim.com/userfiles/file/8271558233.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/db18ceecfc4458d3c415d257c87b767e/45227583429.pdfIn PDF document text
    • https://agmatbaa.com/upload/files/zuvukaxokupuj.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/bi82dj6vuupt87mmc05kh7njbi/117483456.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/zagugesupefofag.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/77925289729.pdfIn PDF document text
    • https://cakenepal.com/userfiles/file/42650513867.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/ca8m43jttv40tfj8bcbim31aho/92052512369.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/i76s0uc79je0adtc91lm9g1ce7/13333907586.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_off0000cffc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFFC 17868 bytes
SHA-256: 4173153d2ef06536432f6977dd29702b08836008b34cc8ed7792b68236ff5aca
font_01_sfnt_off0000fdbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDBE 11604 bytes
SHA-256: 27ca44765887fcbd70f7d2510a29d1c44da9d41356d1d8b1a5c35c79c19202f4
font_02_sfnt_off00011913.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11913 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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