Malicious PDF — malware analysis report

Static analysis result for SHA-256 442a54d50406c548…

MALICIOUS

PDF

82.5 KB Created: 2021-10-29 05:48:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 4ff9845b805e08ecba763ed1f5464bd1 SHA-1: 69c1d685711bbb4fb54fdd5e2a4f0bc15ef1929d SHA-256: 442a54d50406c548c38ad5587a2020eabf1266dfb76b298efdce64da01a2cdcf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' suggests links to compromised WordPress uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution via these links.

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://synerhu.ru/uplcv?utm_term=hansel+and+gretel+witch+hunters+2013 PDF link annotation
    • http://www.huntsvillepr.com/files/files/zatigizuzuzotoba.pdfIn PDF document text
    • http://hkwwta.org/userfiles/jopupogegemojadadeta.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613815ac83bc1---luvuniwowutoxititemim.pdfIn PDF document text
    • https://darman.shasbod.ir/UploadedFiles/New/file/ludowajobo.pdfIn PDF document text
    • http://denkobarbell.com/_upload/files/30603926157.pdfIn PDF document text
    • http://ganteltechnology.com/system/userfiles/file/95422824434.pdfIn PDF document text
    • http://alfadent-volg.ru/images_uploads/files/putajadivokep.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/91602447415.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/60862938510.pdfIn PDF document text
    • http://ogledalata.bg/uploads/pages/files/38893916733.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16169db987787c---98112826769.pdfIn PDF document text
    • http://goksirkrupskimlyn.pl/img/upload/files/wilokekivezevirelobalivid.pdfIn PDF document text
    • http://studiocalderini.it/userfiles/files/zozitufatidajosupu.pdfIn PDF document text
    • http://hcm-invoice.vn/hinhanh_fckeditor/file/41380097741.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/pixibodugopiwox.pdfIn PDF document text
    • http://phutungtdc.com/upload/files/73729802935.pdfIn PDF document text
    • https://chothuexeninhbinh.net/data/dulieu/files/50975552176.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/fudupirasitodamikamasubip.pdfIn PDF document text
    • http://gartenstadt-apotheke.com/userfiles/file/10770420514.pdfIn PDF document text
    • http://anael.fr/fckeditor/userfiles/file/12109646165.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f50c75d752---xogederotikafukoxowojuze.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1616ae652d3bae---vadasawisarabevuwesoxevo.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/75869307074.pdfIn PDF document text
    • https://adikmanis.com/contents/files/63208982102.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_off0000d571.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD571 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED83 21204 bytes
SHA-256: 4400e7908e64201732cde0aa498ab9442883e93353e236aa2391090f72bfc833
font_02_sfnt_off000122ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122AD 11172 bytes
SHA-256: 68e6a47668345e202cbacccc7ab5e411eb3ed309c1026a5ae8758d2d258b69b4

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