Malicious PDF — malware analysis report

Static analysis result for SHA-256 d88efa4d653c8765…

MALICIOUS

PDF

70.5 KB Created: 2021-09-02 03:53:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a609d60d5bf6c8f4c0be7b732d71c4ff SHA-1: 7048be2cf0c18a8b27a319319ebb75d92c8a4be3 SHA-256: d88efa4d653c87656c8e3a36f3a4e42c722a122e63048102bfeb54c9081a9b12
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating it is likely a phishing or malware distribution lure. The file functions as a link farm, containing numerous URLs pointing to compromised websites and potentially malicious content, suggesting an attempt to redirect users to harmful sites. The presence of multiple links on compromised CMS uploads and disposable hosting further supports this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://monamifrance.com/FileData/ckfinder/files/20210702_02BB8BA085311872.pdf In PDF document text
    • http://jatechkj.pl/upload/fck/file/57710007546.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/vejss4qi9g1ahk3lu3im85p6me/38666113245.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/het99h4ahdeluj7aqqljn77fu4/tumofaxudovofuzowuma.pdfIn PDF document text
    • http://abyss.sk/userfiles/file/bamibate.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160747a4035db0---60525050689.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/7316a4163b3fd56e143f6b9da6fdb2dc/15797193926.pdfIn PDF document text
    • http://hattingtoemrerogsnedker.dk/userfiles/file/mimedoreziluge.pdfIn PDF document text
    • http://armiikrajowej36.pl/public/upload/ckfinder//userfiles/files/tepawumetogokanud.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/mewisiderex.pdfIn PDF document text
    • http://triple-a.co.th/ckfinder/userfiles/files/liwamekefajex.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160abba780d2bd---mokurige.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16075c8becb2b0---13566089814.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/66539546720.pdfIn PDF document text
    • http://lnshiyue.com/userfiles/file/20210727184746_1281435535.pdfIn PDF document text
    • http://hrt-foto.hu/_user/file/27980741289.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/d3fef3b83108bd48e2ea06b5e4ccbaf4/13317446985.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/6693420857.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/wuwadazeleluba.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/faknikqgalojp7hrn39v3rah1p/denirefetibo.pdfIn PDF document text
    • https://homeuu.biz/upload/ckeditor/pages//files/93181236332.pdfIn PDF document text
    • https://pcparts.fr/ckfinder/userfiles/files/kipigewuvavuvavuto.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=easy+lunches+for+menPDF 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_off0000b5ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE00 15364 bytes
SHA-256: 1d28b8a14fa6936397c0463ec9eba2373046de3ccdd2cb4fe272415a9797aa1f
font_02_sfnt_off0000f465.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF465 10608 bytes
SHA-256: b4a5e083db3a0d97e8a9677c53248622a5856874154c1ef27a6156cea8f274ae

Open this report in the interactive analyzer, or submit your own file for analysis.