Malicious PDF — malware analysis report

Static analysis result for SHA-256 f198592ce1239953…

MALICIOUS

PDF

68.5 KB Created: 2021-09-29 12:03:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3240d65576861fa281a5f3a494fdd3ea SHA-1: 930735f20394a8f170019a7adba545c898b0a20d SHA-256: f198592ce12399531bdcfa915c9ba3ec7a2d40bfc834d20106e0a325ccdcb0aa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable hosting or compromised CMS uploads, suggesting a link farm designed to redirect users to malicious content. The presence of these link farms and the overall structure strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://raiporjai.com/piceditor/file/78737387395.pdf In PDF document text
    • http://cx-gl.hu/images/files/74670543558.pdfIn PDF document text
    • http://wpklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/juwivix.pdfIn PDF document text
    • http://loca-granderoue-montaletang.com/ckfinder/userfiles/files/dulajodarudotip.pdfIn PDF document text
    • http://grapes4u.ca/sites/all/sites/grapes4u.ca/files/jakov.pdfIn PDF document text
    • http://galsabino.it/userfiles/files/dunamimugijekinidub.pdfIn PDF document text
    • http://monthclean.com/uploads/files/202109011754322648.pdfIn PDF document text
    • http://sacmacbook.net/userfiles/file/27637318325.pdfIn PDF document text
    • http://kperrylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fujozezaleputefodevekigig.pdfIn PDF document text
    • http://thietbikhachsanvinhhung1.com/upload/files/38977599291.pdfIn PDF document text
    • https://cryptoshift.be/anaeter_capital/siteadmin/userfiles/files/77861131150.pdfIn PDF document text
    • http://chinajnbt.com/images/upload/File/luditikatoriwepiwapit.pdfIn PDF document text
    • http://huiking.cn/uploads/file/090446439789.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/16149641f2bfa2---30580616977.pdfIn PDF document text
    • https://jmclimatizacionhvac.cl/images/subidas/file/naperewureduvebobe.pdfIn PDF document text
    • https://www.antoniopopolizio.it/ckfinder/userfiles/files/87612262348.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210911_B89804BC39DA495E.pdfIn PDF document text
    • http://mega.kz/media/upload/files/rozijusigize.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615180bc699c3---34952514823.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/puleroxebuxuzom.pdfIn PDF document text
    • http://uptownchantilly.com/uploads/files/xoweranikarabagop.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614139886ce31---11574551619.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=periodic+table+element+3PDF 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_off0000ada1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADA1 15320 bytes
SHA-256: 260b09ab2e8596dd972a142b29b7eef670be79a9e733ca369d20aa8f5a44d543
font_01_sfnt_off0000d490.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD490 10676 bytes
SHA-256: bc44481594acbf2d44bcb24af44582880e09ca8f84b8003e3cee5330bf976150
font_02_sfnt_off0000ed02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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