Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4f8b7e39f2b1079…

MALICIOUS

PDF

111.2 KB Created: 2021-09-03 05:50:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a8ab93a6e4ba7e292acc399c512b869a SHA-1: 2067f26db88e76def26903eb634b5646cf25219c SHA-256: f4f8b7e39f2b1079caefc54dcd87ee198968dcbe8a3efefd3f5c41ff827bf7a7
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, pointing to multiple compromised CMS upload locations and disposable hosting sites. The embedded URLs suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://conblocmanado.com/pics/file/nexijekulalepode.pdf In PDF document text
    • http://ylgems.com/file_media/file_image/file/kenojipivasusuvebefeze.pdfIn PDF document text
    • http://gsxr.hu/userfiles/file/3332894922.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076403b65a01---72368970449.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccd66d86a66---75309228189.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d56261c6ead---68345301763.pdfIn PDF document text
    • http://staceyasp.com/UserFiles/file/guwowem.pdfIn PDF document text
    • https://yptea.com/data/fckeditor/files/kigosavir.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d58e1cf0c---6027814337.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9be54c8a4e---kiforon.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/66d16c10f50dde27cc49807094baf9c4/rijomepo.pdfIn PDF document text
    • http://www.dr.schure.net/ckfinder/userfiles/files/guxaropimuf.pdfIn PDF document text
    • http://componentcnc.hu/uploads/ckfinder/userfiles/files/xikuvezolaka.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611a51b8cae8b---27867681675.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/16123b95c991f4---moginofesewusefa.pdfIn PDF document text
    • https://excore.hu/ckfinder/userfiles/files/87070612416.pdfIn PDF document text
    • https://csodamalom.hu/files/files/19658984597.pdfIn PDF document text
    • https://leresto-niort.fr/images/userfiles/files/lamuvujinivofanivodiz.pdfIn PDF document text
    • https://birudongker.com/contents//files/68007064282.pdfIn PDF document text
    • http://modellszerviz.hu/userfiles/file/31183682002.pdfIn PDF document text
    • https://hiddencliff.kr/FileData/ckfinder/files/20210801_6AC0861068B00F00.pdfIn PDF document text
    • https://webshopplus.nl/app/webroot/files/userfiles/files/13026450046.pdfIn PDF document text
    • https://xn--hjrnskadeakademien-mtb.se/userfiles/file/23777490649.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=jurnal+difusi+pada+tumbuhan+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_off00015215.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15215 17020 bytes
SHA-256: 2e7ae5ad931583598f23c7c580e9a7f9891aa4941996e596df060ace34209a47
font_01_sfnt_off00017ebb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17EBB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000196d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x196D2 10740 bytes
SHA-256: 9e986cd971f428a28a5fd72185e46bc1c916287fba1ce84c243eac2895344a6e

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