Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4e40c96860ab01d…

MALICIOUS

PDF

79.4 KB Created: 2021-09-06 08:37:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8b1465fa4b92d3c1ac4eea8fd26f664d SHA-1: e2480453637c2a204345e50efb9bc2628f8dd4d9 SHA-256: a4e40c96860ab01d95a2453b44ea3a188250c735c5481866f04c36587f0962af
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and links to compromised CMS uploads, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links are consistent with a link farm designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 https://huntic.ru/uplcv?utm_term=fluid+mechanics+pdf+bookboon PDF link annotation
    • https://zhansq.cn/upload/file/gemuzisuvozefuzuvivolop.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6qbn1pdkimca3tftoc39l5b430/13387140814.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/79bdd2f6cdeef3a4f9c68402e6b924e1/81270966751.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/xitisevigeko.pdfIn PDF document text
    • http://trinkhorn.org/userfiles/medubo.pdfIn PDF document text
    • http://uniquecharacters.com/upload/files/40246063053.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/95568209781.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/92117594915.pdfIn PDF document text
    • https://art-lamps-rali.eu/files/file/37622706726.pdfIn PDF document text
    • http://innospectrum.eu/hirlevel/file/48706339064.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7bc3dc0517---xoludejepakadeka.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16086e78a14863---geselomidinetulisok.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16103dd759a64f---73550182371.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16098b0e83b8b8---vuravogudum.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013new/admindia/ckfinder/userfiles/files/kudaxug.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b564340493e---19239634744.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/d2dfcfb2029480333a29a71c9f8dfb62/68830627311.pdfIn PDF document text
    • http://abwcockeysville.com/uploads/files/21860709081.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/pomagiwavatujut.pdfIn PDF document text
    • https://absolut-fit-and-dance.de/wp-content/plugins/super-forms/uploads/php/files/aaqs4lguq4e7llvr6lvi6mkl26/pumiw.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160afb09812165---70250802297.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/ur7mir7bb028pvm2ojittm4g6j/83301611086.pdfIn PDF document text
    • 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_off0000d49e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD49E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB0 16848 bytes
SHA-256: 4d74273f5b16acf64af43aa95d422ba48ec44fd2d6d0d19255c77282a7f9e115
font_02_sfnt_off000117b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117B8 10996 bytes
SHA-256: f26fd24959b077abfc06d1d4616e5d46fa4c2b14d555adeca3e1f483586b5153

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