Malicious PDF — malware analysis report

Static analysis result for SHA-256 1478aabdf0b98f2b…

MALICIOUS

PDF

81.5 KB Created: 2021-07-19 20:17:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: b7a12e4710ca88c55ff6bd407b412de4 SHA-1: 45fd8964c531b3822fa415b2d6bed6be6645e063 SHA-256: 1478aabdf0b98f2b0398e40fd3e01bf41d4ce63524e1054bc998e50238cd5b8a
156 Risk Score

Malware Insights

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

The file was identified as malicious by a ML classifier and ClamAV, flagging it as a phishing trojan. Static analysis revealed it functions as a link farm, containing numerous URLs pointing to PDF files hosted on various domains, some of which appear to be compromised CMS uploads. The presence of multiple PDF links and the use of disposable hosting suggest a tactic to distribute further malicious content or manipulate search engine results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://ooo-kenk.ru/userfiles/file/folifozi.pdf In PDF document text
    • https://aimhc.com/userfiles/file/vopepigolupimaropi.pdfIn PDF document text
    • http://ansatrans.ru/admin/ckfinder/userfiles/files/60206760122.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160967aaa49f5e---97069331481.pdfIn PDF document text
    • http://nesthomes.in/userfiles/file/daguwepedodewute.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/pqsu004b91502rtm4kriphsrhb/84102857002.pdfIn PDF document text
    • https://funcarele.com/ckfinder/userfiles/files/62224631871.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3ee3d87c09---sojima.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/mapizifiserixoxevuduvemo.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/93112186185.pdfIn PDF document text
    • http://osc-pribor.ru/products_pictures/file/debilozub.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/nokojaxurazufij.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e66a11c756---41597080599.pdfIn PDF document text
    • http://beateromer.com/bilder/file/detokuporuke.pdfIn PDF document text
    • http://proxima-design.cz/files/file/pukoboxufexeroxuler.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/c4aba54521ae1f16706966b6e0a60fe3/woluserepexedanajij.pdfIn PDF document text
    • http://sovaimm.it/userfiles/files/90200290807.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/jcdadmh2kj7g324hk091tgd42n/89615430945.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2ccb63c8b---92537270869.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/gafujovababapasanelofedu.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/6fe91b6e2afaecd228e2ac201da38631/17613602072.pdfIn PDF document text
    • http://ahchala.com/img/file/mozovutirok.pdfIn PDF document text
    • http://stinpo.com/ckfinder/userfiles/files/zopovor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+cite+a+paper+chicago+stylePDF 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_off0000dc22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f434.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF434 16120 bytes
SHA-256: dc9aa9ad8f6faa6af6fdeb1c0604add72513f0c1dbfe5d65813415d48f82c356
font_02_sfnt_off00011e1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E1E 10740 bytes
SHA-256: 4b55e7feef52b077712653a7b774806bc088023173d6f2f3c3c3b65a8d593390