Malicious PDF — malware analysis report

Static analysis result for SHA-256 52da458652d0584c…

MALICIOUS

PDF

83.2 KB Created: 2021-10-05 18:58:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 093f2e6c0efc94015f0666e209ba1f9c SHA-1: 209e05ea6bdbbf434f3324fbe7b350d356a32760 SHA-256: 52da458652d0584c37ad907d4e5b10565adc7dbc4ef6bca5fe88ddb8346eac86
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised websites or disposable hosting, suggesting a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or exploit kits. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the link farm behavior and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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://honmamon-s.com/img_seminar/userfiles/file/16665393024.pdf In PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137d51760627---febakukipubewisej.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/vintkldss4cs18k6v8aqkcceb7/xamasunitop.pdfIn PDF document text
    • https://inprovitecuador.com/ckfinder/userfiles/files/16827137214.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210910_4F0249B66070B54C.pdfIn PDF document text
    • http://ghefootmassage.com/fckeditor_userfiles/file/95655095821.pdfIn PDF document text
    • http://peak-experience-japan.com/images/blog/file/63810815448.pdfIn PDF document text
    • http://xn--pr3b03lcdvwu9dpynqkc.com/DATA/file/20211003232102.pdfIn PDF document text
    • https://itscebu.com/upload/file/20210926135110.pdfIn PDF document text
    • http://dealershop.es/camarasegovia/userfiles/file/48783767894.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/94921144287.pdfIn PDF document text
    • http://rubella2.integra-sh.com/userfiles/file/79320258099.pdfIn PDF document text
    • https://smgbid.com/ckfinder_userfiles/files/7624463103.pdfIn PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.com/filespath/files/20210929074555.pdfIn PDF document text
    • http://nebovsem.ru/app/webroot/files/files/giwakava.pdfIn PDF document text
    • http://sm300159.agchost.com/userfiles/files/wepolitelubiki.pdfIn PDF document text
    • https://unique-u.biz/images/uploads/file/3608214219.pdfIn PDF document text
    • http://lingeriedediva.com/UploadFile/file/2021091413162973499.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/rf7ju8h36lppdoj5nib611bb4s/kaxuvuvedifuxefodawe.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/85955197114.pdfIn PDF document text
    • http://crocepadrekolbe.it/userfiles/files/kexovilovaw.pdfIn PDF document text
    • https://retake.dk/ckfinder/userfiles/files/wedexesixu.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/bi6din349nqipa2oms2ao0gjqn/ripuwubodunolovosetej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=ms+excel+practical+questions+with+solutionsPDF 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_off0000df0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF0D 18396 bytes
SHA-256: fbcfc79e1cc84f8137f5a7394eaeac44089da809e8aebe653190d68a99b3f330
font_01_sfnt_off00010e56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001266d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1266D 10896 bytes
SHA-256: 145d12d32efcdc72f67bc3853d3c55f26854f9d26c2f16e1780a4359ba3cb661

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