Malicious PDF — malware analysis report

Static analysis result for SHA-256 e32b33a18144e010…

MALICIOUS

PDF

73.6 KB Created: 2021-09-12 19:21:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3bb3d762c69dc4e3196e412ce9f1eeba SHA-1: ee81f188661b7716ebc1fefa050c1ea7e15f9e2e SHA-256: e32b33a18144e010e0578d80c26640ece20d9c890c25aa3186237e41f7b06cda
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as containing a link farm, with several URLs pointing to compromised CMS upload storage and disposable hosting. The ML classifier and ClamAV also identified it as malicious, specifically a phishing trojan. The presence of numerous links suggests an attempt to manipulate search engine results or redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://simpangkanan.com/contents/files/19507591841.pdf In PDF document text
    • http://euskararenginkana.eus/files/galeria/files/gafejal.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133f983d6d79---96130417264.pdfIn PDF document text
    • http://24horasnoar.com.br/ckfinder/userfiles/files/gunodutuvufo.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/wixivekedibinupazulu.pdfIn PDF document text
    • http://innovad-ltd.com/userfiles/file/49943307533.pdfIn PDF document text
    • https://colegiumaniucarei.ro/ckfinder/userfiles/files/46867768639.pdfIn PDF document text
    • http://psychanalyste-gard.fr/ckfinder/userfiles/files/99883855896.pdfIn PDF document text
    • http://cgmorenanews.com.br/ckfinder/userfiles/files/57350645947.pdfIn PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/24255387492.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec944f14dc---85071943364.pdfIn PDF document text
    • https://xtremefitksa.com/ckfinder/userfiles/files/90597401443.pdfIn PDF document text
    • http://noahmission.org/dataroom/file/vuruwesadozos.pdfIn PDF document text
    • https://hse.tw/upload/file/sufigufiv.pdfIn PDF document text
    • https://freshchannels.com/home/sites/freshchannels/public_html/ckfinder/userfiles/files/42334646376.pdfIn PDF document text
    • http://sunrui-ti.com/d/files/42242584833.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b91e900d07---13074095070.pdfIn PDF document text
    • http://snft.ro/media/file/wisefakivewuxaxowipimawow.pdfIn PDF document text
    • http://marasintl.com/public/ckfinderuploads/files/31071970864.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/5706297216.pdfIn PDF document text
    • http://csc-0411.com/userfiles/file/20210906080404_0hpft8.pdfIn PDF document text
    • http://urotunisia.com/uploads/FCK_files/file/pudagaxix.pdfIn PDF document text
    • http://metalltechnik-kutschi.at/19326362883.pdfIn PDF document text
    • http://cherriestattoo.com/ckfinder/userfiles/files/94000525302.pdfIn PDF document text
    • https://cleartunemonitors.com/ckfinder/userfiles/files/80670676098.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f40a70a3f4---96252057663.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/10084751906131b49049a67.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=android+google+map+search+autocompletePDF 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_off0000bb75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD387 16960 bytes
SHA-256: 1ced9d8b7a12d701058943d1b5496f60508d49591d08f27a26679ef9271a8975
font_02_sfnt_off0000ff4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF4D 11040 bytes
SHA-256: 6b7842959bdfaa275a4a41f098f436a01ba9d6e932123ac6f632a37a82ecc382