Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b787661bb1604db…

MALICIOUS

PDF

89.1 KB Created: 2021-09-18 00:50:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f30a6819538a9a5a1fedea2994958a78 SHA-1: b07f7520e15c2419d9bbc73debbc68efca0be84b SHA-256: 3b787661bb1604db09b316d8d41a5d7462bc3d172e69e04c4899fbf8d4de4703
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. Heuristics reveal it functions as a link farm, with many URLs pointing to potentially compromised websites or disposable hosting, suggesting a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF format itself can embed JavaScript, which is often used to redirect users or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://aleshashop.net/uploaded_files/userfiles/files/wonexugede.pdf In PDF document text
    • http://evergladesharvesting.com/ckfinder/userfiles/files/vovafovugogenajaliril.pdfIn PDF document text
    • http://engineersclasses4competition.com/files/others/92187622014.pdfIn PDF document text
    • http://northmarking.com/userfiles/files/saxup.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/lujenipisenuwewelikilade.pdfIn PDF document text
    • http://www.lbtfilm.com/uploads/files/xeledofurukezifurur.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2b5e98062---18586655387.pdfIn PDF document text
    • http://potya.com/tajakepirokifuzulogalib.pdfIn PDF document text
    • http://bbfederico2.net/userfiles/file/47395748230.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/gubutepepuj.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/4m3t7bir3rmlk2s27d8otpl566/35233424749.pdfIn PDF document text
    • http://word.mn/uploads/assets/basewunufezexefozixubujo.pdfIn PDF document text
    • http://j-line.ca/fck_upload/file/71216067068.pdfIn PDF document text
    • http://asfalon.com/__files/file/17468333952.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/11562249958.pdfIn PDF document text
    • http://dongamold.com/fckeditor/upload_files/file/74314194056.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16138ae14df7ed---tojerovimugud.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/82845594255.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/godomeratogofu.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-5/20210905103337350019.pdfIn PDF document text
    • http://ansonseatery.com/uploads/files/31127059901.pdfIn PDF document text
    • http://gld-lining.com/user_img/files/rogujobowikoko.pdfIn PDF document text
    • https://santechnikosdarbai.lt/images/files/81434581296.pdfIn PDF document text
    • http://helices-evra.com/userfiles/file/26755902116.pdfIn PDF document text
    • https://jogamiskolc.hu/ckfinder/userfiles/files/45305425172.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/s7f87ng4lup17e0o51tiok0pri/17130303660.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=where+can+i+watch+a+bronx+talePDF 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_off0000f9a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000111b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B7 10480 bytes
SHA-256: fd88bca61f3c938abd2c69367108f0182d6173ce680eb80419f47b923bc198de
font_02_sfnt_off0001298b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1298B 17396 bytes
SHA-256: 1c96651dae5eb0fa8914055acfddf5164cae465a326784128bac52c78a4e9bee