Malicious PDF — malware analysis report

Static analysis result for SHA-256 34c471806ae1b51a…

MALICIOUS

PDF

81.5 KB Created: 2021-08-14 22:43:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 7c57391b5d3f883a9e5b6e6887c3e484 SHA-1: cfaec31e6cd6c75e50448842de2e1e0fe91a4197 SHA-256: 34c471806ae1b51a5d38cdef8173b9a98bfe13bf688a30becd693157c530ded6
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories or are hosted on disposable domains, indicating a link farm designed to distribute malicious content. ClamAV and ML classifiers strongly indicate maliciousness, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://lasanisports.com/files/fisej.pdf In PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0fb41e2391---54398230589.pdfIn PDF document text
    • http://vce34.ru/attachments/file/kafowosapaluwupiwoximuval.pdfIn PDF document text
    • http://granite1962.com/clients/869125/File/penekijosatugit.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/depuzuvowapope.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c700be26f07---xotowuvoseravogano.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/6593844274.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0bca39976b---vawezabivulavomegope.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/416f470aa9d42479eddae9e9a95d264c/xowikawurotid.pdfIn PDF document text
    • http://hyunbulsa.org/~ewedd2/userfiles/file/3899180828.pdfIn PDF document text
    • http://cmtsport.com/pliki/53709864581.pdfIn PDF document text
    • http://dientrotiendathc.com/media/ftp/file/2969998096.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/28145710687.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608613169022f---24174191376.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100490017c0c---nawadutetujixixokoleviju.pdfIn PDF document text
    • https://ruedi-leuthold.com/userfiles/files/9429708588.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607050f4cd116---tuvilovufanibotavema.pdfIn PDF document text
    • http://shsuorui.com/uploadfiles/fckeditor/20210628/file/16248602418273.pdfIn PDF document text
    • https://nisahanpin.com/calisma2/files/uploads/letixosaluzavitavosukeri.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a415898b1bb---gasabilorogusutafipi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+change+message+center+number+in+android+10PDF link annotation
    • 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_off0000daa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B5 16564 bytes
SHA-256: 6aba3ab930967c643e49194e786479c343a5a4a1ade05cf8c05c2f27fc73d88a
font_02_sfnt_off00011dcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DCC 11260 bytes
SHA-256: 14a9cab64aa9c982a653eab1cbf9d6f8a1ab2012f15102eea153301b711d8cf2