Malicious PDF — malware analysis report

Static analysis result for SHA-256 0455da37613900e0…

MALICIOUS

PDF

82.4 KB Created: 2021-09-06 05:30:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 61b975e6a92f5620dce62f3e1a4f34a7 SHA-1: adcff1071c56419c185d903fd9c7ae4c00b87ceb SHA-256: 0455da37613900e0c5cc1de3b195c0eda22d33cde40681ce82f746fd3640a65b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs pointing to potentially compromised WordPress upload directories and disposable hosting, suggesting an attempt to lure users to malicious sites. The presence of embedded URLs and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://popmetre.com/news/files/2010149805.pdf In PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607f35b7a8ec3---fozana.pdfIn PDF document text
    • http://konferencii.org/web/uploads/assets/file/5170329385.pdfIn PDF document text
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/76570425206.pdfIn PDF document text
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/wosesupujokukugida.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2nuk21q3sd6rdksnuembgo4sg0/kibojolusawuvebara.pdfIn PDF document text
    • https://businesslife.com/content/file/gajajen.pdfIn PDF document text
    • https://shriayurvednagpur.org/public/ckfinder/userfiles/files/58354183363.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/99c0v3k42b56gccs2o66kq6i50/garimulirojipupogupasilo.pdfIn PDF document text
    • https://familienarbeit3plus.ch/userfiles/files/56978747590.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/57544921078.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ab5c9237c24---66268908792.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/15952f54e37c4cad012f5aeadf78098a/kebogaxisetere.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607421ae4713f---27615921030.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16124b68c4fea2---62685095871.pdfIn PDF document text
    • http://maihome.hu/admin1/file/82106224263.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16094dd8aa6a7c---pekibokodekuzorokosobunux.pdfIn PDF document text
    • https://vrindaindia.com/php/joseph/uploads/file/zubepojaxivizujaxuguxizaf.pdfIn PDF document text
    • http://www.sudaff.com/pics/file/37943618704.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///fobatenipujibesosun.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/nurunijoxuramupovulomukul.pdfIn PDF document text
    • http://soundreaming.org/wp-content/plugins/super-forms/uploads/php/files/f78493de8b2aaec6b983fce7cf2bba99/89251288584.pdfIn PDF document text
    • http://keigan-productions.com/clients/863431/File/95344645331.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=chemistry+grade+12+nelson+textbook+pdfPDF 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_off0000dc68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC68 11596 bytes
SHA-256: 0d616018b840ce3b513df6238ae81bae36eeb26f87a875957ce9fe4f2584f0e2
font_01_sfnt_off0000f77c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF77C 16972 bytes
SHA-256: 7fd8bcd1eea2f40ea3dbebdc58a304353cccc6de36d71fc4e1e8cc7110bd38e9
font_02_sfnt_off000123ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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