Malicious PDF — malware analysis report

Static analysis result for SHA-256 533ea268f10f656c…

MALICIOUS

PDF

69.9 KB Created: 2021-09-26 02:31:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 11b11470c8a3b00534737446c18b75aa SHA-1: 647b698b254b2f70da40f9960c6d5fbb0944a1db SHA-256: 533ea268f10f656cd65380f14706f2fc8b7afe96e7a1e0869bf878dd40cdc108
176 Risk Score

Malware Insights

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

The PDF employs a common phishing lure technique, presenting itself as an image to entice user interaction. It contains numerous links pointing to potentially compromised websites, suggesting an attempt to redirect users to malicious content or phishing pages. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://marmetal.cevhertemizlik.com/userfiles/files/tegowerofonosozemazi.pdf In PDF document text
    • http://coolbiotech.com/upload/files/12402694431.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/ropemetalulevalilix.pdfIn PDF document text
    • http://dnepropress.net/files/file/12304248867.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/3611944a7aca998695955dbefb21573e/dugiroropamuroseloduwi.pdfIn PDF document text
    • http://abwvictory.com/uploads/files/ponovekorokoxi.pdfIn PDF document text
    • https://uleshuzatabc.hu/files/file/nalawisiva.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/9b3f38ceb164c49622fad560136a7346/70965314629.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/tebagoxe.pdfIn PDF document text
    • http://sarkanyhajo.hu/files/file/fabib.pdfIn PDF document text
    • http://1qjd.com/upload/files/2021-09-17-13-00-08-AWO3DeLY.pdfIn PDF document text
    • http://tcihk.com/userfiles/39752009677.pdfIn PDF document text
    • http://redactron.com/userfiles/file/37154398622.pdfIn PDF document text
    • http://sun-green.nl/ckfinder/userfiles/files/1205820272.pdfIn PDF document text
    • http://www.lebedosapartotel.com/data/yukle/files/62807162011.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140103c7c3f7---porokuwoxefapusafoz.pdfIn PDF document text
    • https://3redsquares.com/phpsites/vertical_living/uploads/file/62270927766.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614c17af5a6a1---wixazuvovolotivogilo.pdfIn PDF document text
    • https://vanchuyenduongsat.vn/upload/files/fabolewudenuti.pdfIn PDF document text
    • http://www.sloepverhuur-debiesbosch.nl/upload/files/10154710354.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/24559002966.pdfIn PDF document text
    • https://galaxytraining.examinationonline.com/files/povabudekuriwib.pdfIn PDF document text
    • https://epagneuls-bretons.fr/caningest/images/file/debivodilizatov.pdfIn PDF document text
    • https://iveducentar.com/uploads/assets/file/50575407209.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/vazoloti.pdfIn PDF document text
    • http://acudrved.com/ckfinder/userfiles/files/zudanutoveriwomimasu.pdfIn PDF document text
    • http://chrisdepanneservices.fr/Sites/cds/files/jogewagusov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=6+trillion+in+numbersPDF 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_off0000b524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB524 14152 bytes
SHA-256: c3f893aa0e4d7085da7fb915e579d23d648e8ea09ac862805f4506ee7cdb3618
font_01_sfnt_off0000d882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD882 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f099.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF099 10420 bytes
SHA-256: 29386f46aed037744797c685e739284e0fb6526a37a70289e5a5304121f864ea

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