Malicious PDF — malware analysis report

Static analysis result for SHA-256 338224e87b352c97…

MALICIOUS

PDF

82.0 KB Created: 2021-09-05 19:51:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 333f0bc8b35f389036117990987b9ebf SHA-1: 83e4687cb4679203b826c03db5d014667b201839 SHA-256: 338224e87b352c97299d5f49dce195811ab42d856fd25ba105aa47a14d125d2c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://juniorclublivorno.com/sitonews/images_upload/files/kalamip.pdf In PDF document text
    • https://network-italia.com/file/77311233009.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/332lgiba5hg2cvp19fl5fcop74/52440804298.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b2b58939cd8---nifomozepe.pdfIn PDF document text
    • http://daikinhbac.com/upload/files/vikum.pdfIn PDF document text
    • http://chinhsuasolieu.com/media/files/49342775583.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/zajavaremivubemesi.pdfIn PDF document text
    • https://dunakanyarfesto.hu/ckfinder/userfiles/files/mujejelumizisadirenod.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16088057f7fc1b---69706228534.pdfIn PDF document text
    • http://grimastone.ru/files/64685538760.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607112d37d178---9850626468.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/98363438096.pdfIn PDF document text
    • http://studiobardinisrl.com/userfiles/files/jazazotano.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/0005a5e56d8b8705f7bde58750cdde54/45635582604.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/bot0185o1u2eh300a8dce7jkh7/47855636746.pdfIn PDF document text
    • http://checopharma.com/upload/files/37997199262.pdfIn PDF document text
    • https://brothers-music.com/ckfinder/userfiles/files/6915494703.pdfIn PDF document text
    • http://local-minicab.com/survey/userfiles/files/wopixi.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffb8a9824c---45071919776.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/77028336367.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/161303c78ec021---deworinokumolakufebesodif.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/fhghv7obt826tigavp7kuo9504/61999957749.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=suma+de+numeros+enteros+ejercicios+resueltos+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_off0000d9df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9DF 18160 bytes
SHA-256: bbbc7e9c69dca2dc9269e0ed16473d0a7130a73f6ec540c60888932f2ead38b8
font_01_sfnt_off0001081d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1081D 11084 bytes
SHA-256: 3cc5b56f936bade04095c9acf0ff2e42a9b0483b29a2e1ebaad6d440dc530228
font_02_sfnt_off000121e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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