Malicious PDF — malware analysis report

Static analysis result for SHA-256 795fb23370bc39a0…

MALICIOUS

PDF

81.6 KB Created: 2021-09-14 09:51:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2d53e09534614724ffa4e977a3747ce2 SHA-1: 40af0947eabd0ac4c6381bc7f4a8bb610082f49f SHA-256: 795fb23370bc39a0d4498361f6122c88b17cfde34ee1a2a42c16c81e68ae7095
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which appear to be hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution scheme, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://pixomot.ru/uplcv?utm_term=minecraft+1.16+mcpe+monster PDF link annotation
    • http://www.cerel.eu/images/wyswig_images/file/vuxogudunivobun.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/ec99fcb76436f0cc56a155f527cb0c97/4950787000.pdfIn PDF document text
    • http://phamtrangia.site/upload/files/83862522530.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/48a11ec8fdcd0c5e7762f2f7041a30c2/wilozuxuw.pdfIn PDF document text
    • https://robert-zauer.cz/userfiles/file/jilaguseloni.pdfIn PDF document text
    • http://lnaixi.com/userfiles/file/20210914135556_1730445794.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/39098777521.pdfIn PDF document text
    • https://ndmoyun.com/calisma2/files/uploads/59929502980.pdfIn PDF document text
    • http://villapellegrino.it/userfiles/files/43236798531.pdfIn PDF document text
    • http://fusiongrup.ro/userfiles/file/zamavinisat.pdfIn PDF document text
    • https://adci.vn/data/upload/file/xolesobafulavakajif.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/2smc5ldqvv9jhmdp834mm8928h/11276294502.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0614e5816---86685703204.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/5edb4538b205f574619a0d354f563226/53174143154.pdfIn PDF document text
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/kikidigakixijokepi.pdfIn PDF document text
    • https://mai-avto.ru/upload_files/file/27543935017.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/454afa91cb708ad9d43857ba0413540c/sogevezigewigel.pdfIn PDF document text
    • https://aynispirit.nl/userfiles/file/putuj.pdfIn PDF document text
    • https://inprovituruguay.com/ckfinder/userfiles/files/49221773516.pdfIn PDF document text
    • http://architettoangeli.it/userfiles/files/40644365750.pdfIn PDF document text
    • http://toitureetfacade.fr/data/Files/donidobepovenu.pdfIn PDF document text
    • http://think6.net/ckfinder/userfiles/files/20210907104631.pdfIn PDF document text
    • http://portamarioarchitetto.eu/userfiles/files/jegelunagemonajadoxil.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/nazuwopowininusosek.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_off0000da09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA09 17856 bytes
SHA-256: 94f2653beb9086eccf5699d5ffe8385f2afa36661bbaa06834d58a398227cf24
font_01_sfnt_off000107f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F0 10876 bytes
SHA-256: 8044f36a40992a6604e019f0f9d1c1c028e639d8b5dff3d48126e273ef78049a
font_02_sfnt_off00012122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12122 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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