Malicious PDF — malware analysis report

Static analysis result for SHA-256 c375d5fb45201de9…

MALICIOUS

PDF

86.7 KB Created: 2021-07-14 05:02:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 65273bfbdee4d6fa36bfde393bf2e965 SHA-1: 999d95ff857da2281749eaa4f4f796d0b5350af3 SHA-256: c375d5fb45201de903c90536d846bad546aeb7829725c27122dabc0ad123b5ac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the heuristics point towards the document being used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://naturallabs.de/userfiles/file/6061863519.pdf In PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/2d124ae7d540d8a6f3de96f9f9864266/57004709061.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160836714be434---zemapeje.pdfIn PDF document text
    • http://accronline.com/userfiles/file/23337234380.pdfIn PDF document text
    • http://ahsaipu.com/v15/Upload/file/20214292312153774.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/40870acb9eafb4455817e9390e2caf94/rolamevedaxaluxuli.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/6a8bee6ee2b5d17339a3dcb3711996e4/jaxabovirozo.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/51314238306.pdfIn PDF document text
    • http://scmsalliance.com/clients/864514/File/33583231892.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/1fe68faa9a8756fd7264021a07881750/bezezurupijiruvotirowe.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/ngn7b0dpd9gq6g1d33cm0h2m7l/buwopaxagutezezipixatu.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609eeb0a344c3---jorifepalipilenuwawi.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/4vlont247uv23pejo9ub1m6cpq/nezawok.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/gimen.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///gagokifuxuzanotezetusejob.pdfIn PDF document text
    • http://losmarinoslanzarote.com/marinarubicon/admin/file/dawakaw.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/majugefog.pdfIn PDF document text
    • https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/tekuwulili.pdfIn PDF document text
    • https://0286869143.com/editor_images/files/47664888280.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/vrbqasoci92u664cmk9l7vn0c9/27503238509.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/21934445648.pdfIn PDF document text
    • http://on-call-anatomist.org/ckfinder/userfiles/files/wojodezesi.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c2b2e8a5d---98492419780.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/4diec2eehh7v44hp2nn04oij7n/67828652503.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=merge+pdf+with+excelPDF 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_off0000ee7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010692.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10692 10528 bytes
SHA-256: ce25b0fc155a39284445eb9c5b2884b882ba1c4d38111da9bb93a27bbe8533dd
font_02_sfnt_off00011e77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E77 17888 bytes
SHA-256: 8f15365d516fa1ebe03a2145ae0cba3e984a528aa3b836d70e2949fb5006f8e0