Malicious PDF — malware analysis report

Static analysis result for SHA-256 44d6efa23a491812…

MALICIOUS

PDF

85.7 KB Created: 2021-08-09 16:41:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: da2fa3d23bed7ea9eed083aad7b198a1 SHA-1: 8b697b399c43226ed8454b4a03d931bbf9de2cb0 SHA-256: 44d6efa23a4918126b3228ea379b17877163170b08cc5fdd880b86c6ec467c22
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable hosting. These links are likely intended to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608025f008799---32409427684.pdf In PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6cb9077cb8---sopejolukaditin.pdfIn PDF document text
    • https://www.moxiclear.com.au/application/third_party/ckfinder/userfiles/files/jofunegurame.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/0ec4lnr53lh964kafob8u6aae2/63276406222.pdfIn PDF document text
    • https://ilmercatinosottocasa.com/file/50093532183.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/telorev.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/fcfb9b5c567275a71e875e3e9eb437d9/vofoxarurut.pdfIn PDF document text
    • https://artbynela.com/uploads/file/kixilowefavatijovaguwawup.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1610c999515961---gobim.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bafcd908f4---79388339005.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073e923e3c33---kivobudubalalerobeb.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb07dc24d5---wekalalosusosivokixurumow.pdfIn PDF document text
    • http://bhavalaya.org/ckfinder/userfiles/files/vivewamimodenijiro.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160fccfe19ef94---kujaramuvibuzibeto.pdfIn PDF document text
    • http://licausi.it/userfiles/files/xudekiwetefikegufirela.pdfIn PDF document text
    • https://uleshuzataruhaz.hu/files/file/junojipuxamidoripirasulo.pdfIn PDF document text
    • https://livresdarts.com/ckfinder/userfiles/files/93742796318.pdfIn PDF document text
    • https://opsclown.it/ckfinder/userfiles/files/dibikukuzupiluvelosawom.pdfIn PDF document text
    • http://keramann.ru/uploads/files/37516872566.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/files/weleraxatunubem.pdfIn PDF document text
    • https://landi-bg.com/images/file/4407418363.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/70195878550.pdfIn PDF document text
    • https://aravlicraft.com/cmsCart//upload/file/jiliwa.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/ef179a2faf626212caaf3a0c2eb8b952/15176154217.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=algebra+2+chapter+1+practice+workbook+answersPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000d03e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xD03E 17944 bytes
SHA-256: 31fb0b2007aebf51cfa0ba5234b930a8597a23e6d3b5914f1853f21bf2bb5108
font_01_sfnt_off0000ebcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCB 16216 bytes
SHA-256: 52042c502edfc6c33c916975bdb12134173c7c80c3f8966b16c2deec4bb080bc
font_02_sfnt_off000115d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115D3 11124 bytes
SHA-256: 8d2e37509fdb303e4c0afda372a31219187539631bad0a10deef811efb31023f
font_03_sfnt_off00012fbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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