Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f671939ab152461…

MALICIOUS

PDF

159.9 KB Created: 2021-07-24 21:57:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 57c7e0e1eed0691a162d76f2f431e699 SHA-1: f6688a4aa259b783b8e04b907621613a986a484d SHA-256: 9f671939ab152461238594b16739ad5ee057cb4b9ddb21442d37e4fe5d8719ec
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting. The document body was unreadable, but the presence of numerous external links suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9752

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 https://makanbanyak.net/contents//files/gekefizulanen.pdf In PDF document text
    • http://airlineclassof66reunion.com/clients/c/cb/cb51827d251551eca15067b3b23580a4/File/wonegojojijopik.pdfIn PDF document text
    • https://ancoraeducacion.com/images/84287971848.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/tnt8qmsea77mj2femqfrulj41b/dudodudo.pdfIn PDF document text
    • http://idealhca.com/admin/images/file/jupiwojesukikewilesam.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609e244f4c6b8---xawedutemedul.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160891bbfb24e6---repiwel.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/40269286427.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/34189081180.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/lekomegupowe.pdfIn PDF document text
    • http://geoplan.su/userfiles/file/biratex.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b72872834cc---21539097291.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160798bb0de4f5---gavigiga.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/e1e616b6t1vfn55a5tdotcfe7q/basugunesogoxugibewuk.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/01dedd09e791a3ac387abd06e102e149/wisuwebogopazizopemefan.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/4hvkadoj1899auoiuevg746ot2/68134669216.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d8e662b891f---mubupatatabuwabadetil.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/66b3fe601c435f7d39d9b36aca8b6174/midofuwikolimutosumupubu.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/16388345650.pdfIn PDF document text
    • http://flexicourse.cz/res/file/juxinutejet.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/afe8118f89b69b22850121f950033e47/xokesevibe.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/28de28a4796b538e7965ba1a9a3f7fe0/lexifexaluvumuxemosuwabi.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e465517cb3---13999625252.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/7481aed5c22f962f37e82d5027e67492/vivoremamogifuzab.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/95799248412.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/39046381791.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/vimojoroz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=cerere+activitate+rar+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_off00020b33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20B33 21168 bytes
SHA-256: 3ada0e3562eeff6524e0272f57b097e9137fdd2060e6d80042f95e752c9b2ffd
font_01_sfnt_off00023f76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23F76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0002578d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2578D 10272 bytes
SHA-256: 0b8bd5da53c8abb45130b7d10578ead74c78c70370d07efc78ea4cf60a75eaf5

Open this report in the interactive analyzer, or submit your own file for analysis.