Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7ef303d813de40f…

MALICIOUS

PDF

80.9 KB Created: 2021-06-30 21:25:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: b26aece33fa891807055d94d3bdf7236 SHA-1: 2ed68429812a5904846255c0220c11504ad8185e SHA-256: a7ef303d813de40f9d5ef8e2c20830ea2d2307495dafe5fd67a48e65d0d5bde9
164 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous links to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

Heuristics 7

  • 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.
  • 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 https://infrive.ru/uplcv?utm_term=rihanna+love+and+affection+mp3+download PDF link annotation
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/e00fe088401bb2e86fc893f4b91e7f61/juvozinutomopigofoseri.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210625_095240.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/sunefuwagizukanagumez.pdfIn PDF document text
    • http://ozona.pt/wysiwygfiles/file/26640417572.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/b760a068a21e6b6f283f9c8b881e73e7/zitij.pdfIn PDF document text
    • http://tnslib.su/userfiles/files/96595394726.pdfIn PDF document text
    • http://phuwangnam.com/user_file/file/67569453024.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/dcde7a644812cd004f53756812d24694/88182358145.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/97622939998.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160984cad9e0cb---33627250715.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afdd4a21ea1---kezelobokuxuwej.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/88f72746f67a1efe0c82e0f02a1fe169/77910981007.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/6a5bb03ea06151c4e57ff0d3b18f1590/65761729599.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609ecbe309487---jineg.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a29ddc72361---sapenas.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/e562b49e99480dd58d34729a1d3967cd/vunorixiji.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa68f1583b---28140819281.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/febivazozipowomisofajabol.pdfIn PDF document text
    • https://gegeny.hu/uploads/file/62058105167.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/58432529658.pdfIn PDF document text
    • http://xn--80aamdqpfpr.xn--p1ai/upload_picture/63735029851.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/rewatemununelasizuzenasit.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/8c62b759a24433675b95f1eb062a0876/90243168405.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c953.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC953 10984 bytes
SHA-256: b5bada482e0a55caf40bd8c4c7a5ecacb1bf3c3fe3162065143e63b8988e08e5
font_01_sfnt_off0000e2b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fac5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC5 20276 bytes
SHA-256: 43d39e7451a844499fa8926b230e9cac68d731ae7bc6d0ea72cfd07f094445af
font_03_sfnt_off00012d85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D85 1676 bytes
SHA-256: 62ed0aad0a9b10b2402713d2684f93fa47eb32210640db54b9d8404c956d903d

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