Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4e920d2a9af236f…

MALICIOUS

PDF

86.6 KB Created: 2021-09-11 22:28:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8a3a4cf4d98838f1d2f145f1e6f2a2dd SHA-1: 443d04cefb504faadae94720e421f2e6f149d005 SHA-256: a4e920d2a9af236f2d768fb333e26df24eb88c1cb6786dc521557ef37a0da508
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm directing users to multiple external URLs, some hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://allytemp.ru/uplcv?utm_term=flappy+bird+apk+for+iphone PDF link annotation
    • http://abwcolley.com/uploads/files/lubogufan.pdfIn PDF document text
    • http://iscelenie.info/files/file/najekukebipexuloradaw.pdfIn PDF document text
    • http://pozitron-s.ru/userfiles/file/mogurupufelidemekegop.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/161320a5458708---44598236643.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613914c5c0313---67913215373.pdfIn PDF document text
    • https://emons-verlag.com/testarea/cwsCMSlight/media/files/duvaxidoletajigevemalim.pdfIn PDF document text
    • https://coopinproject.eu/ckfinder/userfiles/files/68082290317.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613a5f772fe4e---relopawi.pdfIn PDF document text
    • https://cairparavel.ro/app/webroot/files/userfiles/files/rugoketazulir.pdfIn PDF document text
    • http://lianbang123.com/uploads/files/202109091121296862.pdfIn PDF document text
    • https://scalper.ir/data/files/file/webafubolazowotepafaj.pdfIn PDF document text
    • http://nigerseedindia.com/uploads/zipujelivewu.pdfIn PDF document text
    • http://tikatalog.sk/_files/file/75545799270.pdfIn PDF document text
    • http://ltptech.vn/uploads/userfiles/file/mutanuwabuzoremidawijuzut.pdfIn PDF document text
    • http://rongqichem.com/upload/files/wetutidewo.pdfIn PDF document text
    • http://designklasse.de/ckfinder/userfiles/files/gemarililekabobabaxe.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161341947aa8b7---zoluma.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/hiv9vs2kh89gs90gepdheap52s/99354882090.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/f4544cf44633f6e89412c6f345cdf995/sironuwobalokog.pdfIn PDF document text
    • http://xatrbio.com/userfiles/file/fofemikefajedawomafu.pdfIn PDF document text
    • https://creteotels.gr/FCKeditor/userimages/file/34941089788.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef12f1428f---jikufadutefof.pdfIn PDF document text
    • http://hujiangsy.com/upload/files/38817375550.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613771c8d2aa7---nuwekig.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_off0000ee25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010637.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10637 18248 bytes
SHA-256: 5b1293ceb67ac78125d8fc78a371226e4de20a3cd669f2cf8da97a38bb9e16e3
font_02_sfnt_off00013523.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13523 10652 bytes
SHA-256: 1f181e98343250aa9c030f5803b96f77957b3d1812a7a8f6240cec2346ae0644

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