Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a75e3338e4dc6f0…

MALICIOUS

PDF

93.0 KB Created: 2021-09-01 03:08:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f0caff4922e553ca51cb48e0a1b6888c SHA-1: fc6a47b545455709640e802a5b57d3f39a8e0586 SHA-256: 1a75e3338e4dc6f0b6dbe7025ea6d1b92e572d1fc525c4eae80fdeb066d3678d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress upload directories, suggesting a link farm designed to distribute malware or conduct phishing. The presence of external URI heuristics further supports the attack pattern of directing users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://inwebjor.ru/uplcv?utm_term=code+for+1+million+robux PDF link annotation
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982f059d2c1---jerem.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5314cb510---44984245943.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d34a2d36e89---vunipabubefakozuzefufasus.pdfIn PDF document text
    • https://mlmrockstars.com/ckfinder/userfiles/files/fenasojamorerogisej.pdfIn PDF document text
    • http://beijingbeat.com/contents//files/fijatinakuvajamixivozax.pdfIn PDF document text
    • https://momsgardenfoods.com/ckfinder/userfiles/files/kewelojelitovexutusota.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b97177613fd---gujudejemikepiwoxasudodel.pdfIn PDF document text
    • http://lblussana.it/images/file/xuxefoleziseti.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/gimidujogir.pdfIn PDF document text
    • http://limeitec.com/upfiles/editor/files/bolubag.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d1af91994---lupinobiseruli.pdfIn PDF document text
    • https://baongochoa.com/upload/file/nomadudanafuwo.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160adc81279a18---rotudoxege.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16082343780131---69661190202.pdfIn PDF document text
    • http://omni-links.com/images/blog//file/79118860656.pdfIn PDF document text
    • http://hansungidschool.com/userfiles/file/89463876178.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfe7aa306ea---tikekepisikawasudigi.pdfIn PDF document text
    • http://hkalc.com/userfiles/91349806946.pdfIn PDF document text
    • http://dh-cell.com/ckfinder/userfiles/files/putofadavejufop.pdfIn PDF document text
    • https://blueparadise.pl/userfiles/file/64116218620.pdfIn PDF document text
    • http://ceraunavoltapizzeria.it/userfiles/files/sewizoweduwunon.pdfIn PDF document text
    • https://cincia.ro/ckfinder/userfiles/files/25835705217.pdfIn PDF document text
    • http://studiocalcinoni.com/userfiles/files/puxapifidakuso.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c057a352f4a---rezudimewuku.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/551e95d3cd1856285332dffc09819a3d/dotutozufarimuzugezaselo.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_off0001056d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1056D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011d7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D7F 19056 bytes
SHA-256: e0ac56e71a2cf0c7121d791004e129b617ea5c067058c747fda96b36ac9b11b8
font_02_sfnt_off00014e5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E5C 10512 bytes
SHA-256: 498a637a8b8a3fb25c2c1e59d980c0cfdf4e5509d8d13294f59e61c310e965af

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