Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4497c15de1c8023…

MALICIOUS

PDF

69.8 KB Created: 2021-09-28 15:47:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 166ab880e60416a9e3e9089bf8e2d0bf SHA-1: 3200ea5c4a0063c9fbed2aaef4332b97c150b533 SHA-256: b4497c15de1c8023cba459caeb8474d6dbda7b4548ddca0cc45020ca4bbd781a
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing or tech support scam. It contains numerous links to potentially compromised or disposable hosting, suggesting an attempt to redirect users to malicious content. The document body is heavily obfuscated, but heuristic analysis indicates a callback lure, prompting users to call a phone number for issues related to billing, refunds, or security.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://rybczewice.pl/userfiles/file/55170054021.pdf In PDF document text
    • https://sklepbonus.pl/userfiles/file/50658951574.pdfIn PDF document text
    • http://nanoservice.cz/upload/file/29990783391.pdfIn PDF document text
    • http://kernenshepler.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/71449636021.pdfIn PDF document text
    • http://nattuvaartha.com/assets/ckfinder/core/connector/php/uploads/files/72082995930.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/tonexetegexinej.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///84961373266.pdfIn PDF document text
    • http://kcde.kr/userfiles/file/32363752754.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/35175256378.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142f86fcfeba---46592395384.pdfIn PDF document text
    • http://www.swaving-stalinrichting.nl/ckfinder/userfiles/files/65040090891.pdfIn PDF document text
    • https://a-metal.e-giant.net/archive/file/files/xozoxebanutixinolupexadu.pdfIn PDF document text
    • https://bonaparte.cappencms.com/templates/files/97956545072.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210927163643_8r0jsk.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/sunamaf.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1614e8cd115f7a---bajurigojowagoxolul.pdfIn PDF document text
    • https://gulceoyunlar.com/calisma2/files/uploads/gobexerezilawilisokogarap.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16139060b11306---bonuxoxo.pdfIn PDF document text
    • http://saeronbio.com/userData/board/file/28533123874.pdfIn PDF document text
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/75874471609.pdfIn PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/fawipolunejumegepena.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/83376540789.pdfIn PDF document text
    • https://thingstodobahrain.net/ckfinder/userfiles/files/44727575258.pdfIn PDF document text
    • http://www.pethouse.es/ckfinder/userfiles/files/20586012293.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=best+offline+gallery+app+for+androidPDF 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_off0000b2d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2D3 10840 bytes
SHA-256: 237819db3f1adccb994f59576791fd01c718aca4755959d325a972c888f6b987
font_01_sfnt_off0000cbd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e3e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E2 14988 bytes
SHA-256: f97b67b4c54de36e240e2b949f3076539c91c235132464c7d20940e8a0533acf

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