Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d17a776b270cbb7…

MALICIOUS

PDF

96.3 KB Created: 2021-07-24 04:18:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b62978f5837041e6c1a4f70cbbe1c586 SHA-1: 4a31db3e0593db754cee8dc12dcc5ff90f08f85b SHA-256: 0d17a776b270cbb7fc07f1d826d1a3b51f2c28a6c8d0e3e5cdbc63320f5448b3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the nature of the embedded links and the detection names strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16096fdebc1039---48386831943.pdf In PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/dc797c864e34096bfd2f21b47d87a256/muwomadiwufewazidajerax.pdfIn PDF document text
    • https://abeess.com/userfiles/file/43156890780.pdfIn PDF document text
    • http://asirakademi.com/resimler/files/nezadutesiki.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/80826956916.pdfIn PDF document text
    • http://massimoandyuethui.com/clients/69227/File/97661226172.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adec8e7d7ca---kufematapimivofew.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/7f3dcf4a9759fcbadc3b9f3192811fc6/4724332482.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a3df17e25bd---16609216117.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/lupanurexalijevog.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adc60896e45---81751762348.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160715f634b95b---35164086519.pdfIn PDF document text
    • http://www.alcera.ca/userfiles/file/31892927415.pdfIn PDF document text
    • https://wheelmartthailand.com/image/upload/File/89101743951.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/15e61c7be9f539bd10e68dc812725bd8/61365263515.pdfIn PDF document text
    • https://gamaconsultores.cl/upload/file/38929207630.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160785795abe1b---jopiwudavosevuxe.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607175b141bf2---lorudisijolawaf.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/lojodugeravazikov.pdfIn PDF document text
    • https://sportyou.fr/ckfinder/userfiles/files/komemofaj.pdfIn PDF document text
    • https://digireg.ru/upload/21805335069.pdfIn PDF document text
    • http://hk-dcc.com/wp-content/plugins/super-forms/uploads/php/files/g2lh1l2tr421nunc3p19pk8vno/motixoviwa.pdfIn PDF document text
    • http://baldonimarcostudio.eu/userfiles/files/60331112630.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16071753f2e32a---bunuwusubusobuliwusolasi.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f33a4468c15---69094469883.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=ejemplos+de+los+ejercicios+anaer%C3%B3bicosPDF 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_off00011104.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11104 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001291b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1291B 10968 bytes
SHA-256: 37f73eb857a00946852eef79276e83868efd3ee62f657b0b391936bbd00554bc
font_02_sfnt_off000141ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141EA 18600 bytes
SHA-256: 29edd567b529835f1984e5b9468b6141e19750df7f327487099d384123b90924

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