Malicious PDF — malware analysis report

Static analysis result for SHA-256 729e1732109b5d03…

MALICIOUS

PDF

71.4 KB Created: 2021-09-13 01:09:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 41201bbb21f54a922f9bdec6cc11bde8 SHA-1: aa091f2c52a4786f2fef3b75afd7ad98d9934273 SHA-256: 729e1732109b5d036999b9070646fd11c0eb6df60647f58691f4b049b355f228
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristic analysis revealed it functions as a link farm, directing users to multiple external URLs, including one associated with a compromised WordPress upload. The presence of numerous links on disposable hosting and the use of 'utm_term' parameters suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://coretry.ru/uplcv?utm_term=utorrent+premium+apk PDF link annotation
    • http://htbestcomputer.com/media/ftp/file/88959527802.pdfIn PDF document text
    • https://inprovitmexico.com/ckfinder/userfiles/files/81108934574.pdfIn PDF document text
    • http://hoachattn.com/image/files/nopagobexokowiguvodubuge.pdfIn PDF document text
    • http://peak-experience-europe.com/images/blog/file/22635391792.pdfIn PDF document text
    • https://megacook.pt/site/upload/file/98325863669.pdfIn PDF document text
    • https://zenmobile.in/jaipriyart/uploads/files/detuwizikivewarujixixe.pdfIn PDF document text
    • http://prompol.com/media/file/78194895642.pdfIn PDF document text
    • http://indigobaby.eu/upload/files/65851241678.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f48d1cbc39---wuluwuloravudewukana.pdfIn PDF document text
    • https://fratellifurloni.it/file/46342555036.pdfIn PDF document text
    • http://pension-erlkoenig.de/img/editor/file/98912934423.pdfIn PDF document text
    • https://fsreloading.com/userfiles/files/84174543953.pdfIn PDF document text
    • https://ddmmaze.altruistictech.org/documents/img/upload/files/23041699726.pdfIn PDF document text
    • http://futureinfashion.com/ckfinder/userfiles/files/kemapagokonigapavibof.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16130e891b275d---xetikapavunawig.pdfIn PDF document text
    • https://macroedunet.com/userfiles/file/jalubitimofunopaw.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16132db6860f01---96351574839.pdfIn PDF document text
    • http://deborahmayerlawoffices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gafij.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f64ab8acad---gaguvo.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161382009622af---24815503181.pdfIn PDF document text
    • http://kedehg.com/ckfinder/userfiles/files/1360943111.pdfIn PDF document text
    • http://showpelec.com/data/file/20210904_082742_492.pdfIn PDF document text
    • http://yuhenganquan.com/userfiles/file/20210912032004_1572404128.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_off0000b88c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB88C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d09e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD09E 16108 bytes
SHA-256: 1748d79041b999dbe9295dfeae5d3dd1142a80074103395e35be04a9787019be
font_02_sfnt_off0000f90b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF90B 10400 bytes
SHA-256: cb68ac273cdb29cf5356a1c720f5b1396b1873b0ae7e67fd0546d0c504d3b530

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