Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc9e143efb64c98a…

MALICIOUS

PDF

89.1 KB Created: 2021-06-29 03:59:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 898e4a8fed5306f173b685cdf7d36848 SHA-1: 65669e876becbd2ec0eeb816868fa62d0a688746 SHA-256: dc9e143efb64c98adb42e13a3cd881f33a057e3fae33c239751011109417d8ad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or malware distribution intent. It functions as a link farm, containing numerous URLs pointing to various websites, some of which are hosted on compromised CMS platforms or disposable domains. The presence of embedded URLs and the nature of the link farm suggest it is designed to lure users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://smidgel.ru/uplcv?utm_term=router+switch+hub+pdf PDF link annotation
    • http://acril.ru/ufiles/files/tabiwinidifuzosor.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16086aabaa14b3---73913735661.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/0636ebc1524bc2c464e69450342edfe5/piwewim.pdfIn PDF document text
    • http://auroraenergyproject.it/userfiles/files/nonezedalamaxux.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/364056257.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/38248839187.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/bimogakemaga.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c7c3406f6c7---64513279558.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160811b43cfca2---wopurunu.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608615a4ee7ef---17055359707.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/885u932gtlfjne59o1b65014r4/27790209787.pdfIn PDF document text
    • https://giustofiori.it/file/tixadumujamuregu.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/48627616524.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c7646300b---97406183866.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/fd958r1a7ljbbv3l8e704i3kt1/kelabiporof.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/ffea24cb1b6bfc1530b4d266e915696e/kazixirufezid.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a436aa9902d---37530392476.pdfIn PDF document text
    • https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/liom3jji7nstodsjmmlfbn7h6q/29615140725.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160bd5dde91e6d---kokakomopovazudijekufi.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/982240686a5bef606465ba0b547517c8/sebozawopo.pdfIn PDF document text
    • https://x-software.cz/data/file/pudojukemivululi.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/5ur9vn7mtgghvckg6dfubpek7i/17793369933.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160beb90dd86f3---19811314103.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_off0000f669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF669 10776 bytes
SHA-256: e7eaeaa15b8f064f53d744181617a78bbc9986a713812ba6652090c3c8bc9859
font_01_sfnt_off00010f36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F36 19004 bytes
SHA-256: 9c34d10b39bfaf06dfb7ca13f187efad55e0c66122bd5c6a93f24e80bff66381
font_02_sfnt_off00013f52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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