Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cd637a6d3ca19e3…

MALICIOUS

PDF

91.2 KB Created: 2021-06-25 18:20:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 5fe313f21f58a8f02f3d903539e6ef95 SHA-1: 5453ef5548a16517b2a9823ba46624e0cda9cfb1 SHA-256: 4cd637a6d3ca19e3a01e1fe83bf6618cfcc9ba4b8681feb346aaabe8bd8b6692
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous external URIs and links pointing to potentially compromised websites, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the heuristics indicate that the PDF is likely intended to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://allytemp.ru/uplcv?utm_term=always+forever+near+and+far PDF link annotation
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/4f7a43e3c2507a5d0a56f1b3b9e89a01/wolexumokulifelemaneda.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/61626676219.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/848494e50e3677a9e74c70ba64bb51e5/kulivin.pdfIn PDF document text
    • http://uk-finansist.ru/userfiles/file/solasigofabajof.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/ubpi3gsq1o61fo5349amokn8a6/31390368737.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/33a5580d8881873c57e25e34d8632cb3/45642599496.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070d6c3766b3---85521300539.pdfIn PDF document text
    • https://hifi-markt.eu/kunden/kronhardt/ckfinder/userfiles/files/93936150232.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/662bbbf8ddb75bfaa20dc8b4fac3fe19/nisotetiti.pdfIn PDF document text
    • https://activepymes.com/pub/file/gurob.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/10215340814.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082311f491b4---42645853773.pdfIn PDF document text
    • https://webupdate.ca/wp-content/plugins/super-forms/uploads/php/files/oc92h0n9s3f4t9mmhrnjd5oknf/rabipefafazane.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f37c07a08a---63695765616.pdfIn PDF document text
    • http://worldprint.su/userfiles/file/66080034603.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160780c87718fc---25808192344.pdfIn PDF document text
    • http://gustosandvic.com/ckfinder/userfiles/files/pimam.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607d23d766cd0---87977898339.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d4b2153ee---guronigibutedawowuxefazo.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/c8a7904946bd1c365bf99594eb1061d0/mupuw.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f483d31e85---moverazutadoradovowav.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/3661f5fa682b294719dd11bc76ee67c9/16686021422.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_off00010259.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10259 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011a70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A70 10404 bytes
SHA-256: 814e72f40d79bc240977a81db22bc537e61b89278ff157b14857da76f4e51794
font_02_sfnt_off00013237.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13237 17300 bytes
SHA-256: aa00b6b6b2eada1b25e3d449951fea23bfacb42a6ca940fa557a8c04cd0369a3

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