Malicious PDF — malware analysis report

Static analysis result for SHA-256 f178cf0b7b7b4f8b…

MALICIOUS

PDF

70.8 KB Created: 2021-09-26 08:54:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ee532a0efefd34dc3873e336ff4bd7e5 SHA-1: 0dabcb224ec608ca8ad9266e1ab981d5cd90481b SHA-256: f178cf0b7b7b4f8b61e174ee9e305c171f6c30d259e51f70662f476ef8e68c25
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of numerous external URIs further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://ngocphuocjsc.com/public/default/ckeditor/files/xivedawiwebelav.pdf In PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/4377071f166e6bf5a629d20944c6ee2c/kawobipujer.pdfIn PDF document text
    • https://www.nitm.ac.in/nitmeghalaya/ckfinder/userfiles/files/girokubufodoku.pdfIn PDF document text
    • https://kaimano.it/file/29498012509.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/wapujovuripazuni.pdfIn PDF document text
    • http://marinda.ru/pics/images/file/fokam.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614d1aef91ebd---wivowutejupixun.pdfIn PDF document text
    • https://cartolmania.it/file/51728995744.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/piravilebejunupuwuxalel.pdfIn PDF document text
    • http://asremajazi.com/uploads/files/13656595366.pdfIn PDF document text
    • https://desense.eu/uploads/wysiwyg/files/sifuweboxomip.pdfIn PDF document text
    • http://nikkenj.com/userfiles/file/zawunitajujip.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d222905389---bosijuganuzozakotom.pdfIn PDF document text
    • http://thegioixedap.net/upload/files/kulebafitonawelapet.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b04f14d14e---powomavokufowojemozixusix.pdfIn PDF document text
    • http://mdfgiare.com/upload/files/rapepovurezivev.pdfIn PDF document text
    • http://thekitchendesignstudio.org/uploads/files/mewagemugaginakima.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/76649143721.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/25875047301.pdfIn PDF document text
    • http://dongduong.net/Images_upload/files/63972416218.pdfIn PDF document text
    • http://vipnjl.com/userfiles/files/27633072159.pdfIn PDF document text
    • https://tipresentoio.it/images/file/26692423773.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/1incldq2o917u8pb0a6ohqpto5/nunodudalorijose.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=biocalculus+solutions+manual+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_off0000b210.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB210 16772 bytes
SHA-256: 1031ba8da1e10d432f9ec7fb1de9968ed830ed83bc53cd48080f23b5d30c4e30
font_01_sfnt_off0000dca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f4be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BE 10704 bytes
SHA-256: f5ea31cf96a596a577aeff5d46c7637400d3132c95af82f75b6034ea7c4469ca

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