Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b876c62e68229ce…

MALICIOUS

PDF

78.2 KB Created: 2021-09-27 14:00:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 6df1689fd396e87b88b84682c1ffdfb2 SHA-1: 7c498e934c7bf46f239b5612e675a054c00b66bd SHA-256: 9b876c62e68229cefaad6b13f64c6f93fc1a073b039a1c5c72783db579b47725
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised or disposable hosting, suggesting a link farm designed to redirect users. The 'SE_CALLBACK_LURE' heuristic indicates the document's content is designed to trick users into calling a phone number, a common tactic in phishing and tech-support scams. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics strongly suggest a malicious intent to deceive users, likely leading to further compromise or financial loss.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 http://alumcity.ru/userfiles/file/59272562394.pdf In PDF document text
    • http://nhatrangpalacehotel.com/app/webroot/upload/files/vezaribedebirewaluxabo.pdfIn PDF document text
    • http://tetobox-budapest.hu/uploads/files/netajodipeku.pdfIn PDF document text
    • http://viethanit.vn/hinhanh/file/mexagorukeluwikonufatejol.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/97053382617.pdfIn PDF document text
    • http://csc025.com/userfiles/file/20210916230442_cfrskp.pdfIn PDF document text
    • https://htijsr.com/userfiles/file/99698566473.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f58265cc94---74890274468.pdfIn PDF document text
    • https://kaimano.it/file/zirage.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/59986185506.pdfIn PDF document text
    • http://madiagranitosilano.it/userfiles/files/42419432048.pdfIn PDF document text
    • https://jancsoalapitvany.hu/ckfinder/userfiles/files/70442398960.pdfIn PDF document text
    • http://vodnik48.ru/content/file/80992727838.pdfIn PDF document text
    • http://maidichike.com/upload/files/tuditusajuzopukubadav.pdfIn PDF document text
    • https://srsatta.com/ckfinder/userfiles/files/sujixavexexe.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/v30g3kj7out0tu7vur1g2hg3b0/towagolip.pdfIn PDF document text
    • https://defi128.phpascal.com/userfiles/files/22506280595.pdfIn PDF document text
    • https://cukimentescukraszda.hu/files/files/46166762986.pdfIn PDF document text
    • http://tjjjsh.com/uploads/files/mejezizozuk.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/wijetetajelanimagadinever.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/1bbeb1b1e517ea6f4449b779b25e0288/76501125120.pdfIn PDF document text
    • https://www.canoe.ro/Extras/ckfinder/userfiles/files/64447193116.pdfIn PDF document text
    • http://xn--2o2b17g32e8xisqq.com/userData/board/file/84959520743.pdfIn PDF document text
    • http://investbuild.ru/var/upload/file/ponuxevagefibugemo.pdfIn PDF document text
    • http://pay2pay.net/upload/file/51788518637.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f36978aa1b---59797104567.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=english+file+advanced+student%27s+book+third+edition+pdfPDF 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_off0000c61e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC61E 19288 bytes
SHA-256: e6209b99cf727900a7ded7907ca2e7a940638e53421cd9451ffda2e3032e0987
font_01_sfnt_off0000f815.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF815 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001102c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1102C 11312 bytes
SHA-256: 6075cf0f44a92f72dd821671caa21d36873d74b5989034ccfa074ff37ca1388b

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