Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f601217b10cef00…

MALICIOUS

PDF

119.2 KB Created: 2021-06-27 05:53:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 712fd96fd5472eab0eb27fa9e49c0e5e SHA-1: 0b5a3e24e70d737dfbed8649d393273cc2af709a SHA-256: 5f601217b10cef00cbf2e728b4056204ca2740ba0128cd10dad0cc8bdd77ab57
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as a link farm, with many URLs pointing to compromised WordPress sites. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. While no scripts were extracted, the structure and URL patterns suggest an attempt to redirect users to potentially malicious content, aligning with phishing or SEO spam tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160a597a3250c3---vinozevajipewifebepawa.pdf
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7b71410eb8---80868339202.pdf
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079f899cab93---55809358378.pdf
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/db5a399554833850d30bea084459b8fd/sifuto.pdf
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16083838ad55dd---gamimotivu.pdf
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/e4f3d921c994244db465d46ccf00e2b7/43233669452.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5f97e191a---gitofugiwifufanefesozat.pdf
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160795d1c32c55---ropogukutuxovuzewojelowez.pdf
    • http://sbox-technology.com/upload/datoteke/goweriposutiwalevugezix.pdf
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607225614d73c---71826911925.pdf
    • http://acecaalcoy.com/userfiles/file/98889275216.pdf
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/ehugsgimqre1hokcd41ggom7r7/60603704490.pdf
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609afd270c830---suwelanomoxubopot.pdf
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/unktiu6ush1p340e8oloeamhv4/ditoluwozikise.pdf
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/1c34848a5c5533aaf5dc1b0b5a2e820f/46077792395.pdf
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2aed5a89c9---52910421850.pdf
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/4ndjguakoi8dfhkhstnpc3amqr/1860473080.pdf
    • http://a-mega.ua/images/uploads/file/38452528138.pdf
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/61d04e3f8b76d30ad81f43ab6d319233/rasozajuboj.pdf
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba4639017ab---zavexajasewuxez.pdf
    • http://bbbswalkforkids.com/clients/c/cf/cf8d0549bdc9bbdffca8bc0db9808b96/File/fefaned.pdf
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/35pfboiapmh1e12kkhs9q6losk/12637793420.pdf
    • https://activepymes.com/pub/file/safazeritivusip.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=medication+for+typhoid
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017225.bin
9b5248a0e6f98de1cc036f74835bdf350560e5e85c04507b3fc2076467211f1f
pdf-font-stream PDF embedded font (sfnt) at offset 0x17225 17192 bytes
font_01_sfnt_off00019f4b.bin
2b83a0c5406a0854f2af0ca210d3198ea0271d3bb4a331ebf11b2d2e044b3200
pdf-font-stream PDF embedded font (sfnt) at offset 0x19F4B 10612 bytes
font_02_sfnt_off0001b779.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1B779 16792 bytes