Malicious PDF — malware analysis report

Static analysis result for SHA-256 801c27ba8e34c0d2…

MALICIOUS

PDF

83.3 KB Created: 2021-09-24 08:51:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e4617614f75329a7eb5439640782458b SHA-1: 1c47291ad07ce8afc90d9c95806650522d5938ab SHA-256: 801c27ba8e34c0d2991e81edb3c7f05db54febe36fa88f4a0a064d35927693a8
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to potentially compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The presence of external URI heuristics and the PDF_SEO_DISPOSABLE_LINK_FARM firing further support this, indicating the PDF's primary function is to lead users to external, potentially untrusted, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://brilliantsolarpaneling.com/userfiles/file/48941571371.pdf In PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144f7fc11747---tarirumafulela.pdfIn PDF document text
    • https://mundolibre.cl/uploads/userfiles/files/noropujugor.pdfIn PDF document text
    • https://speedwayinfo.hu/uploads/file/75721556014.pdfIn PDF document text
    • https://oasis-travel.ro/files/gosekuxale.pdfIn PDF document text
    • http://dentherapia.hu/files/file/legagowuduzatusemezavudod.pdfIn PDF document text
    • https://maymac.info/userfiles/file/41596384887.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613572bd74ddc---kelivanu.pdfIn PDF document text
    • http://grafiport.com/userfiles/file/fefalegolawimukosez.pdfIn PDF document text
    • http://kasargod.net/uploads/file/8962273973.pdfIn PDF document text
    • https://sanvexe.vn/webroot/img/files/futawas.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/1p0tban0ta6i585u2rh6ugsuh6/vuxafitokidawufe.pdfIn PDF document text
    • http://csc-028.com/userfiles/file/20210908195859_j8i8tp.pdfIn PDF document text
    • http://tce.vn/imagesflashupload/file/25950062154.pdfIn PDF document text
    • http://sibinetweek.ru/userfiles/file/demitagajama.pdfIn PDF document text
    • https://altaamir.ipixpms.com/Rapport/public/assets/ckfinder/userfiles/files/34815459377.pdfIn PDF document text
    • https://satesayap.com/contents/files/20594912751.pdfIn PDF document text
    • http://perevodvnegiloifond.ru/pict/file/48579572651.pdfIn PDF document text
    • https://spvi.cn/filespath/files/20210916223247.pdfIn PDF document text
    • http://industra.sk/userfiles/file/55407129943.pdfIn PDF document text
    • http://samwha.com/upload/userfiles/file/nebawarepolakujunubu.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614c33830552f---87560612380.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/30681531250.pdfIn PDF document text
    • https://cissud.com/uploads/ck_editor/files/tinalikekasolak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=new+tamil+movie+download+2021PDF 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_off0000e045.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE045 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f857.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF857 18084 bytes
SHA-256: d2f05526678e07e2728beff9c94d9dfc49e976c1dc52e3f6dde0244354c0eb8f
font_02_sfnt_off0001273a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1273A 10564 bytes
SHA-256: 7d1ad3e1c92160665fba39238644e86ec66278564134add16e79cb2167a5091f

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