Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e1166524fc881d5…

MALICIOUS

PDF

72.5 KB Created: 2021-09-19 14:54:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3e10c369eadc6d1ef1a175429a74ab4d SHA-1: 47c77fbbcedcb5784b6a325cffbdc39fa4924f13 SHA-256: 0e1166524fc881d5dd35cfe3e75b6e4c039ada46f3e8bdff04f25dc9c445969c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF document flagged by ClamAV as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The ML classifier strongly supports the malicious verdict, and the presence of numerous unknown URLs suggests a distribution or phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://luckysim.com/userfiles/file/datal.pdf In PDF document text
    • http://www.gobarging.com/uploads/textareas/file/86294672872.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/es073kv533kdt4p584k551k622/nexeni.pdfIn PDF document text
    • https://yourdentist.ro/app/webroot/files/userfiles/files/porofug.pdfIn PDF document text
    • https://kotypsy.pl/ckfinder/userfiles/files/70593165990.pdfIn PDF document text
    • http://damutech.kz/upload/2021/09files/210910205918961565j8xgo.pdfIn PDF document text
    • http://erpos.sk/data/files/wotigupojekanegevud.pdfIn PDF document text
    • http://woodbridgeabw.com/uploads/files/xajokosiluxejoxez.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/48189247316.pdfIn PDF document text
    • http://nhahanghienminh68.com/upload/files/34222193856.pdfIn PDF document text
    • http://khocabien.com/uploads/files/xajiwifijuruzuv.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/da0b567be06f2d06db1f64d1ad4f08a5/penosuvewuv.pdfIn PDF document text
    • http://studiocommercialedelpiano.it/userfiles/files/89954545246.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/83240409300.pdfIn PDF document text
    • http://maytinhtuyenquang.com/home/maytinhtuy/domains/maytinhtuyenquang.com/public_html/images/file/putenelak.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/4701562970.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613265ffc4021---nulaxevewipufekunalom.pdfIn PDF document text
    • http://condosworld.com/abisol1/userfiles/files/81602791352.pdfIn PDF document text
    • http://turskazka.ru/ckfinder/userfiles/files/65138311604.pdfIn PDF document text
    • http://laibros.com/ckeditor/userfiles/files/89296253021.pdfIn PDF document text
    • https://floridagreatescape.com/media/file/53642386807.pdfIn PDF document text
    • https://armenia4d.com/contents/files/9012919897.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/fpvlktff9m9n2ndbqnjvecvlfg/samivajenereko.pdfIn PDF document text
    • http://rivebistro.net/ckfinder/userfiles/files/13202157377.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=tv+remote+control+software+for+androidPDF 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_off0000baba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBABA 15996 bytes
SHA-256: 9babae64ac27872a1616b021254b9e11274e98832719f8c53181a0dcbde10711
font_01_sfnt_off0000e3cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3CC 10752 bytes
SHA-256: 1046e058686e2452ac9de7594df8a848a74048628c288a23f21e107e9055133d
font_02_sfnt_off0000fc9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1