Malicious PDF — malware analysis report

Static analysis result for SHA-256 d039312be96f1349…

MALICIOUS

PDF

73.2 KB Created: 2021-09-13 16:36:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 97e13b27db6be4a0a1f9e896421c3398 SHA-1: ff4387b034046cbc8559792a665ecd0b9fbfac7e SHA-256: d039312be96f1349b23ccb83c6488a51e91930d7158a5892f40f94ef3483ad31
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous disposable hosting domains, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated and does not provide clear textual lures, but the presence of many unknown URLs suggests a malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://peoplesmodelinternational.com/ckfinder/userfiles/files/49135421501.pdf In PDF document text
    • http://nedirajtebosnu.net/userfiles/file/navode.pdfIn PDF document text
    • http://chanakol.com/ckfinder/userfiles/files/43897771136.pdfIn PDF document text
    • http://studiocastigli.eu/userfiles/files/89654298746.pdfIn PDF document text
    • http://chinasoftcore.com/userfiles/file///viroxavatepofenigi.pdfIn PDF document text
    • http://ecilingirler.com/resimler/files/40819392628.pdfIn PDF document text
    • http://3q1p.com/upload/file/210901202429449501acgik1l53fjt.pdfIn PDF document text
    • http://modernplating.com/userfiles/file/90808212088.pdfIn PDF document text
    • http://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/47820334230.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16136fcc5180bf---futasamibofiputamab.pdfIn PDF document text
    • https://saunadlaciebie.pl/userfiles/file/nenikenifonafubafomivowi.pdfIn PDF document text
    • http://myesen.life/userfiles/file/sibuxubovubusikaxazilibos.pdfIn PDF document text
    • http://www.gdchgs.com/admin/img/files/51279325469.pdfIn PDF document text
    • http://sampoernastrategic.com/uploads/image/files/vuvoxiditutatuwazugudub.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/jowoto.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/aa2b9b67b88ac5cdf2db6067f00f8784/52480313580.pdfIn PDF document text
    • http://taispacedesign.com/upload/files/garigilemokelomariwupa.pdfIn PDF document text
    • https://www.sophrologue-nimes.fr/upload/news/files/67944358984.pdfIn PDF document text
    • http://wintec-samu.hu/uploads/files/38595422305.pdfIn PDF document text
    • http://weiken-rc.com/upload/files/59454062310.pdfIn PDF document text
    • http://gabinetortodontyczny.eu/userfiles/file/55278514905.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16134954bbcf3d---29911425556.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613518eb62c3e---lubonago.pdfIn PDF document text
    • https://zifu-tech.com/app/webroot/userfiles/files/belegewulib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=label+printer+apkPDF 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_off0000bf98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d7aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7AA 16280 bytes
SHA-256: 421231bb8da0939291ab20026e65fb5e0b8a1b351f3b44337a7cd73566ea495b
font_02_sfnt_off00010174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10174 10144 bytes
SHA-256: c741fd7acabed1f4767681541b956958fc424bf0dd25fbd38669f57e6b234276

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