Malicious PDF — malware analysis report

Static analysis result for SHA-256 48a6b6ad9f2db876…

MALICIOUS

PDF

122.7 KB Created: 2021-07-23 17:04:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: dcb65c538d3b50a0bfe63c687e2982b6 SHA-1: a8bdd2852de07109db9b3e02f78bedbd0ae19b24 SHA-256: 48a6b6ad9f2db8760b9f40dda724589d6673683eeda500d4a0aa2fc5b77c6ea9
156 Risk Score

Malware Insights

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

The PDF contains a link farm hosted on compromised WordPress infrastructure, as indicated by multiple heuristics including 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM'. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The document body is unreadable, but the presence of numerous links points to a redirection or phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c88c46c9e6---42074882003.pdf In PDF document text
    • http://www.minaakshimajumdar.com/fckimages/file/9662821323.pdfIn PDF document text
    • https://optimustelecoms.com/ckfinder/userfiles/files/numudidalediwipekaledavet.pdfIn PDF document text
    • http://teacherandtraining.com/coj_u/KK/userfiles/files/72795225487.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/46808733255.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9cc7f742c4---96795171758.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/m3c1dp4gpqntl52sbs8ussbsi7/35805707363.pdfIn PDF document text
    • http://ecohouse-lab.com/userfiles/file/fijigafejinef.pdfIn PDF document text
    • http://brno-skoleniridicu.cz/ckfinder/userfiles/files/50656194685.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb874e573c9---2662801666.pdfIn PDF document text
    • https://kottayammedicalcollege.org/CMS/ckfinder/userfiles/files/vodufovamijevojakila.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d6f46e98f---68086926354.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/9d3453a654c025bd0e12a5b3e7bd1000/vejekupigijaloruxujo.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/gegotexupawomabo.pdfIn PDF document text
    • https://hifi-markt.eu/kunden/kronhardt/ckfinder/userfiles/files/xulelofosokokimowamugaje.pdfIn PDF document text
    • https://emotionalgift.com/ckfinder/userfiles/files/37987472691.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16071ec0f4cc56---bolokod.pdfIn PDF document text
    • https://appfacile.it/file/1020427663.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/vubixab.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/h1l6oo4frt8hfs6ms49h5b8727/somolemodagobubidebokazu.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16072111abf5b8---39846107566.pdfIn PDF document text
    • https://sakkestadbil.no/userfiles/file/rufalesevixonogozarotado.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160896e4327b35---xetunapusu.pdfIn PDF document text
    • http://gleneaglehoa.org/images/file/gotof.pdfIn PDF document text
    • http://studiodabo.eu/userfiles/files/17268385073.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=gero+ciencia+ficcion+definicion+e+caracteristicasPDF 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_off00017bcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17BCF 19348 bytes
SHA-256: 78087ff3c48624009328872a2cad5019ce5920a0c70fcfb43cfe9bb0faa3da52
font_01_sfnt_off0001ac23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AC23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001c43a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C43A 10464 bytes
SHA-256: 133468b9808897836e0219af90540d54b248a7ad6976cdc14e53e66f59d4ffc0