Malicious PDF — malware analysis report

Static analysis result for SHA-256 93c61d767db8cee7…

MALICIOUS

PDF

78.5 KB Created: 2021-09-21 00:12:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: eff08736bf19a167d97efd19d5ce99d3 SHA-1: 4fad28f4ceec2cec5950d8e7f4af71721502e675 SHA-256: 93c61d767db8cee794e266e968c151b3c95a855345ad33c64e74007053d1711d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs, many of which point to disposable hosting and are part of a link farm, indicating a likely phishing or malware distribution attempt. The presence of embedded JavaScript, flagged by heuristics, further suggests malicious intent, potentially to redirect users to malicious sites or execute further exploits. ClamAV detection as 'Pdf.Phishing.Trojan' strongly supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://krr-nfe.com/suratnfe/UserFiles/File/sakuzuzofoxesinemuwovanab.pdf In PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/aa3add0331e15583dc479be73941d17c/korukiralidile.pdfIn PDF document text
    • http://boissee.fr/userfiles/file/diwotepugumimobet.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/70058394928.pdfIn PDF document text
    • http://domoticasociale.it/immaginiNewsletter/file/tafixuniponekikuzi.pdfIn PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/7025412393.pdfIn PDF document text
    • http://giasuthanhdat.vn/Images_upload/files/vixevotijoliwef.pdfIn PDF document text
    • http://snsi.jp/image/news_file/17061779711.pdfIn PDF document text
    • http://toyotarent.hk/FileData/ckfinder/files/20210904_5640A00F3FDC8089.pdfIn PDF document text
    • http://karate-talence.com/newsite/userfiles/files/85537417459.pdfIn PDF document text
    • https://pixel.bg/img/file/19932592863.pdfIn PDF document text
    • http://chalappuram.com/userfiles/file/34004421150.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614139e23adf0---53117954506.pdfIn PDF document text
    • https://xtremefitksa.com/ckfinder/userfiles/files/gukokesoxupoxiwiwilexon.pdfIn PDF document text
    • http://portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/58129761735.pdfIn PDF document text
    • https://resonanceacteurs.nl/userfiles/file/labobomasemesepo.pdfIn PDF document text
    • http://regalmotors-jp.com/js/upload/files/67706702976.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/rufamelanoxi.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/o7rmf5l06vejhgbacgnuf6dp44/kefazizojo.pdfIn PDF document text
    • http://monthclean.com/uploads/files/202109200712403073.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/bifuf.pdfIn PDF document text
    • http://scantech3d.com/files/lidap.pdfIn PDF document text
    • http://kientrucphatloc.com/upload/files/putexaletuxoxiwifilez.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/98e9bf0755c547703b5c703919aed824/62004426021.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/noselipatewolegenixexaba.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/userfiles/file/30597404322.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=love+in+the+time+of+cholera+malayalam+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_off0000c9ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9EC 10852 bytes
SHA-256: bcca51ddfab2cf33c7f429f962e0c0c7e1260a3553a1640652200c4baed3755f
font_01_sfnt_off0000e2c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C0 18904 bytes
SHA-256: bb7e791427018f86af9c9dbb78c8c9b0cc36ee73ce21fad7bbe0af9ba552eb13
font_02_sfnt_off000113ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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