Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e5c4f7bfc9d2af7…

MALICIOUS

PDF

83.9 KB Created: 2021-07-14 02:29:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: b08377fceb29b8e98fd28e2035639775 SHA-1: fd3f1bb89c80e3487d2f14adcf7221590f2d64ca SHA-256: 1e5c4f7bfc9d2af766cbbba887637d94bb03b9ac37ce20b8132aaf007313db43
156 Risk Score

Malware Insights

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

The file was identified as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. Multiple heuristics indicate the PDF contains numerous links pointing to compromised CMS upload directories and disposable hosting domains, suggesting an attempt to distribute malicious content or phish users. The embedded URLs are designed to lead victims to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://fertilizerproductionprocess.com/d/files/dinarurigesedutofezopawo.pdf In PDF document text
    • https://begili.com/uploads/image/files/bokuxivazuzarikatum.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16071e03d27d6c---fenadaliraxuz.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/16070473b4f91e---27274332476.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/7c148b9ca277828c1773210bd8588450/wemofaxebikefet.pdfIn PDF document text
    • http://bsbcarpet.com/userfiles/file/jobona.pdfIn PDF document text
    • http://hosungtour.com/FileData/ckfinder/files/20210712_14D9542970B8DC39.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1181d4900---wenarunibujabufo.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/312862997.pdfIn PDF document text
    • http://raylutickenterprises.com/userfiles/files/pemusasojedumuzebosisale.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/40683709344.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/39657212703.pdfIn PDF document text
    • http://franzoesischebulldoggen.eu/userfiles/file/25978324288.pdfIn PDF document text
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/rhb54e8eh5b78lip32hucmc2u1/32075279728.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/emm7fhptgsv5im85hvonlt4886/ritodirinojiz.pdfIn PDF document text
    • https://gyn-koe70.de/obrazky/file/99945371520.pdfIn PDF document text
    • https://tangentemag.com/img/file/75118299608.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/38a867a0206d85bf664759a5a665e3f8/40492991373.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/38291491645.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/vamosalupuziwujabudojas.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160759d40f3430---78244958412.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a669c806e32---xegim.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16094ea181449e---bivimojof.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/392f32310742f9fec7bea0a42ecc56dc/29506205084.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=rahu+kaal+time+of+todayPDF 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_off0000e5dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DD 10600 bytes
SHA-256: dd00529fbd3fb1261613488ee11158d55ac22c4565cafa4f8782e24538d9bfbd
font_01_sfnt_off0000fe14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE14 16964 bytes
SHA-256: ffe3d95b0c029bf3045d360232edfdc520204c26f2ba88b18e4995c550352aef
font_02_sfnt_off00012a33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1