Malicious PDF — malware analysis report

Static analysis result for SHA-256 71f9517ebb9ccadf…

MALICIOUS

PDF

86.9 KB Created: 2021-06-23 07:55:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 14cb610a545650e72f9e8bce4ff6a661 SHA-1: 399fdbb86942671a3b5b8b650c5bef1910e7b059 SHA-256: 71f9517ebb9ccadf7e0d271b309df2727d9dbf50ae1dd841eb404e90e5579c64
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It functions as a link farm, directing users to download files from compromised WordPress sites, disguised as a business model summary. The presence of multiple links to disposable hosting and compromised CMS uploads strongly suggests a malicious intent to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ff06rind89a04vt68dni8sqbh0/tezirevesax.pdf
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/2uejph46gck156b6p0sto0vlp3/pukasuwijuti.pdf
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/e7e308cb3d666349b1d701d937b04d52/rubowumanened.pdf
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/6ecbe094109dcf0cb01db11b03d8e8b5/59966840772.pdf
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607def5847d72---dexasirufagibulil.pdf
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5ac928be3---10942554186.pdf
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984ef9ab45a---kizabijeju.pdf
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/a26b081a7c0d8dfe8876c3d06cd1b1d0/wagibotizewisir.pdf
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/da6972c34fbb1457eddca165b4c36a7b/64280676936.pdf
    • http://galluccifaibano.it/userfiles/file/45172558455.pdf
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/1d82776c67b9ed789ca2bf045b9df31a/dugixejepenusura.pdf
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/50f147d2dc996d1664cac8bdc6cf532c/29854247047.pdf
    • https://reparation-mobile.net/userfiles/file/67983294728.pdf
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c23ca172c47---21540932549.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf85a6b508.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=business+model+generation+summary+pdf
    • 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://scripts.sil.org/OFL
    • 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_off0000ff4c.bin
a60ba7109350eb8018cd486ec58880bfeca72b7abaca9f0f9828d241fae53fa3
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF4C 5512 bytes
font_01_sfnt_off000111fe.bin
7d587531b24432987937e0a2dd9668ee78ad36180aa16ffc292b3d547048761c
pdf-font-stream PDF embedded font (sfnt) at offset 0x111FE 11588 bytes
font_02_sfnt_off000139e4.bin
2173a1880e9f774f759393e7d0d28dda91d04d8a3eae6bea41b822770b343b90
pdf-font-stream PDF embedded font (sfnt) at offset 0x139E4 16060 bytes