Malicious PDF — malware analysis report

Static analysis result for SHA-256 d916c91c7d776200…

MALICIOUS

PDF

92.9 KB Created: 2021-06-27 18:13:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 33e9228d7d444ccfebbe847822df9814 SHA-1: 4d52ec507c30d8d960fa3120fc6fe8261dd884b9 SHA-256: d916c91c7d7762002e229b6387a6b73e09eccfb276467276090c863badc46050
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://alarrabnews.com/images/content/content/file/jureduvo.pdf
    • https://veaodaibrahma.com/uploads/image/files/78439700774.pdf
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/16073f002a145d---57091087300.pdf
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/44f7e7e13737033501d6ff175d057348/lexigen.pdf
    • http://netinflux.net/userfiles/file/22233723256.pdf
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160751b8169250---68832542940.pdf
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/64b4450a163044ffc223cff91836b4e3/1181485045.pdf
    • http://clubselectionvoyages.com/images/file/fewuti.pdf
    • https://vasantviharproperties.com/userfiles/file/poxefezipeba.pdf
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609432470868f---poteloju.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/b2868fcf95cd5e6885af99d40c17280c/94369922252.pdf
    • http://www.alex-vasilkov.ru/images/wisdom/file/35055193156.pdf
    • http://www.anieliasfx.com/uploads/textareas/file/kalok.pdf
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096bdf05eb1f---94456486966.pdf
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160882e41ba55c---zegidelinibasumizaxubula.pdf
    • http://tokstar.com/_UploadFile/Images/file/54561049685.pdf
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae90f7db1a8---nosifomikagepa.pdf
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/b82eaaa6a6001d65e7fdd33f24890c9f/71956890047.pdf
    • http://burelomdo.com/ckfinder/userfiles/files/berilov.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c02c0638070---jikigoterefom.pdf
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/5ff1e41p817mikr0g0hhc2sv67/gekukebifozuzoradilewamot.pdf
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a052062869---71986600067.pdf
    • https://haltia.mx/sii/ckfinder/userfiles/files/50101462823.pdf
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/9e26a821f09c3c3059b9e1910bf2bce2/43599642945.pdf
    • https://jetaime-shop.com/files/xudugoburogezilu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=chapter+3+notes+class+11+physics
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eeb3.bin
a3acac1f9699b79cecb27753d0620e2a9ccb66076844a3ae93616dcdfd2fb5e4
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB3 10840 bytes
font_01_sfnt_off000107ca.bin
e9011a56013581cfd3346fad036abecdac3a1722d0b3ac5a46fa63a8cd6d08f8
pdf-font-stream PDF embedded font (sfnt) at offset 0x107CA 18336 bytes
font_02_sfnt_off000137e6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x137E6 16792 bytes
font_03_sfnt_off00014ff7.bin
d1ff55f592c4bcea43ccd85b360c3187e32f6098a5c2e755fcb085bc62ff939f
pdf-font-stream PDF embedded font (sfnt) at offset 0x14FF7 16224 bytes