Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dbd2a2fb501e6d9…

MALICIOUS

PDF

82.4 KB Created: 2021-08-15 03:17:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 5d812d70798aaecd51fc0faf7366a063 SHA-1: 31dccbc94b3f1c2d69523c845f848a884dc364ed SHA-256: 7dbd2a2fb501e6d9748298c248dadf8559ba361b6b9e24d9590a2dacac26d89a
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that point to compromised WordPress sites and other domains, functioning as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of 'utm_term' parameters in some URLs suggests an attempt to track user engagement with the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://crewmak.ru/uplcv?utm_term=math+nation+algebra+2+answer+key+section+1 PDF link annotation
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/a7779e632788857095b951f65e8e92ff/95508613294.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/82034822016.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/b00edb7f502bdffd05e305a0df17ee25/lipomoganumidadovepepi.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/livobefenanovetikamupu.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/7b635245bf9ab4bf8aa7f02fbc2915ba/43074734451.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073003103643---nuwitoruwudijuxaw.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607eeacb7dadd---juxesa.pdfIn PDF document text
    • http://andersonlawdecorah.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/22133496806.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/90940318912.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/a187b92e6439222b1d73bc6bf055abdb/2473237895.pdfIn PDF document text
    • https://phuketwebstudio.com/ckfinder/userfiles/files/67018215458.pdfIn PDF document text
    • https://noddy.nu/images/file/72807317640.pdfIn PDF document text
    • http://sushimura1.com/uploads/files/wimobexatanonitomupegufet.pdfIn PDF document text
    • http://kelvista.lt/images/files/18983072308.pdfIn PDF document text
    • http://hoangle.vn/uploads/userfiles/file/119581517.pdfIn PDF document text
    • https://ofertaromania.ro/ckfinder/userfiles/files/34563215217.pdfIn PDF document text
    • http://seyrimerdin.com/userfiles/file/virazaxev.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/98222634129.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/db052e810d96396e0a8adb15aba646d7/jinudisabirexixerosisetoz.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/47601669190.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/gq4girfb952voa8kk2vn92lbcf/9695283502.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/bodunata.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/o3v4lvuobo13gh91l1vr92mrl7/zasusosoregaxonetagevalu.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb1c168e20---78966901926.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_off0000db61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB61 17528 bytes
SHA-256: b3cccf47a7973dd30ce9c2b4b37ecfd240cc6590e6519a8bd60ea29f723e3180
font_01_sfnt_off0001096f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1096F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012186.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12186 11104 bytes
SHA-256: 5e41844f8b7fb132604721b406eb2c42840a3f8715a4f66c02958b25364e9855

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