Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba7bee02a5b60462…

MALICIOUS

PDF

89.0 KB Created: 2021-08-10 09:40:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b8b48671a36fe1e8dbf2f22907f7827f SHA-1: ff3afd7aa5f34c9ecd2579e69845ef004beb444d SHA-256: ba7bee02a5b60462f1bdc35c467c4aaf2e1d4922533453d2dab114d36b941928
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links to external sites, some of which are hosted on compromised WordPress installations or appear to be part of a link farm on disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of a 'download button' lure further supports a phishing or malware delivery scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://synerhu.ru/uplcv?utm_term=cucm+bootable+iso+download PDF link annotation
    • https://tenekedjieva.com/uploads/file/82740343036.pdfIn PDF document text
    • http://gapoom.com/upload/fckeditor/file/58944714669.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160aa91dbb17f8---safad.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/f4298d71bcec28a0d2ed965d739240b5/26203678765.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160790c0c32b83---84306316086.pdfIn PDF document text
    • http://toyotarent.hk/FileData/ckfinder/files/20210704_9497994CE1FCFCD5.pdfIn PDF document text
    • http://andrenickels.de/ckfinder/userfiles/files/35183695750.pdfIn PDF document text
    • https://b2b-intelligence.it/uploads/file/pojebepemizuferoret.pdfIn PDF document text
    • http://manpukulivermore.com/uploads/files/kapifekebubozivid.pdfIn PDF document text
    • https://triptoboloyfoundation.org/editorsfiles/files/wufezujajo.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/7646d4f523e0723e0d357200c5f070b7/96914560106.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/4p16umkfte9dg4knr3kdllfva3/tuwoxigusarujog.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/81360163438.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/8d05918cbd26bde74fb60b198f8dd323/puzigitufufiviru.pdfIn PDF document text
    • http://vita24h.com/uploads/userfiles/file/jimazofetet.pdfIn PDF document text
    • http://pphjako.pl/userfiles/file/nunemulavotov.pdfIn PDF document text
    • http://adveotec.com/img/file/mekovurowisimusinakedi.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfe1b471b64---lufusofamanomemovosore.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/2a2sccalpf52r4c0gg4ojtkljh/kezares.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/90c4a396cc34da821dd385347ce1fc08/67708868163.pdfIn PDF document text
    • http://www.celso.org/download/37634672366.pdfIn PDF document text
    • http://geo-equipe.it/userfiles/files/48266267846.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c668c2aed5d---54619204917.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/spoj7ro7dlm9gvadomsec9ff6r/nabupofajusoj.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DB 17500 bytes
SHA-256: 27dcbee975ec63c943d792586f523796878120fa2d8895f388847e69707f6b09
font_01_sfnt_off00012490.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12490 10788 bytes
SHA-256: c4021a9b3c0ab27ccd78373bb768e93e553a7abdaa54e66a9d1a5d532cda02a4
font_02_sfnt_off00013d77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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