Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b3363847ecd6ef1…

MALICIOUS

PDF

88.2 KB Created: 2021-07-07 04:05:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 684ade3f5beb8c728073991b1f691d0a SHA-1: 3d1702c5aee6d910e2e9468a074334ef9b99f98e SHA-256: 9b3363847ecd6ef15af11cdc1c89fdc6e8d6f1c2605f265d4736c19301d25f47
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 pointing to compromised WordPress upload storage and disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and embedded links are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://queure.ru/uplcv?utm_term=police+suv+coloring+page PDF link annotation
    • http://wildpflanzen-planung.de/file/41506902644.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/ckssuueqtn28st1muf0j0vmt4n/40289786120.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/82477776330.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079a266db9a6---dulonosajujasixo.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16097d3f61043b---vosutebafogalerikuxifazan.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a89b9f014c---33381593615.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c3a4a1b706b---45644585043.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/d239bb7152d2f061a143df4e1d3e00f6/kinozujolejapumo.pdfIn PDF document text
    • http://shssailors1969.com/clients/3/36/366f78b21138e0f8005dfe6cc5e09e30/File/60882994588.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/89ef6c3faf80d87c5e00672bb11dcb22/linibujo.pdfIn PDF document text
    • http://moreit.ch/productinfo/file/7123013242.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/47788274690.pdfIn PDF document text
    • http://win-sonic.com/kida2018/ck_imgs/files/dotofutiwozutasasiz.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/tosimadiwejotumub.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/403a85e7b7b2de6a62a7bf460eb06e3e/38158879562.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/a24c905af8e799d1850efcd99a8d6397/50947437373.pdfIn PDF document text
    • http://nessium.net/userfiles/file/luvuginuzewufe.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078fbf0b170c---61085616478.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/009e6abab5ff21a7d4e33b2bb7a75f0b/xumijalowuwivuzemuroki.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/xovalozewezosi.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/10njueh3k81b546vf0a3iis7kt/dolugufikodawusawolori.pdfIn PDF document text
    • https://ghnservizi.com/file/87080134653.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/14589090717.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/72f4e3d290bd2fc5c58faa8db388e2fb/22222592242.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_off0000f4e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E6 10620 bytes
SHA-256: 523f06dbbec79deb018d09678e1e259b58474c686a78727881fb05b206084a6b
font_01_sfnt_off00010d52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D52 17688 bytes
SHA-256: 83d36ee40f5d871d56677ce27aafc8c8281b7ed324738da9a87c0ae691b03b7d
font_02_sfnt_off00013b7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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