Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1b3fb89b06d866e…

MALICIOUS

PDF

84.6 KB Created: 2021-09-02 10:51:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 07814c4a83d074df8958b118a9e67fae SHA-1: e88be4f25ea522b73f55e48c0f9a67d14cf16312 SHA-256: b1b3fb89b06d866ee1664cef4a54ec2258fafa49d35467bf712ff135a621779a
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. Multiple heuristics indicate the PDF contains numerous links pointing to potentially compromised websites, suggesting an attempt to redirect users to malicious content or phishing pages. The presence of external URIs and link farm indicators strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe28a1368e---vasivuzilipafaniwuba.pdf In PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa84ac7abd---5720917163.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/wabumalesodudox.pdfIn PDF document text
    • http://healthywithhart.com/res/file/20481072322.pdfIn PDF document text
    • https://avistravel.ro/userfiles/file/folodebifulisunamejik.pdfIn PDF document text
    • http://churchtextile.com/userfiles/file/niresawop.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16109d9da52f7c---kanidolosos.pdfIn PDF document text
    • http://streetnn.ru/data/upload/ck/files/86451623866.pdfIn PDF document text
    • http://openendrep.com/userfiles/files/31226846870.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161084a7c8a2e8---nevuforejorodoxelesekaf.pdfIn PDF document text
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/5167d460476a98429f03ba3a49487171/29335762333.pdfIn PDF document text
    • http://apsons.eu/files/file/86889033895.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/biliwamomosiwajilotikirun.pdfIn PDF document text
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sukejufuna.pdfIn PDF document text
    • https://vietucmould.com/img-vietuc/files/94895085674.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/2acc896d78e6db08302cd046f1cd136b/24839825538.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/37b0331c8733812c5db47bdc71e7a816/27870306050.pdfIn PDF document text
    • https://daismene.it/file/vimudawokowakefakunamokup.pdfIn PDF document text
    • http://hkbroadwin.com/userfiles/45921827326.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/sokujovedadarara.pdfIn PDF document text
    • http://panziofabian.hu/fck_kepek/35507215782.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/metetogefifuwelojovujom.pdfIn PDF document text
    • http://mitcostruttori.it/userfiles/files/zuwife.pdfIn PDF document text
    • http://multi-accueil.fr/ressource/site-image/files/rafopotadigenerilefa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=what+type+of+english+accent+do+i+havePDF 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_off0000e34b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE34B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5D 18208 bytes
SHA-256: 4bcdccc16c47abb53cc4c9f1066cb5488e4c5c494139a0cac64c4cca59ed6b66
font_02_sfnt_off00012ae5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AE5 10972 bytes
SHA-256: 3d63664972faf5467e6a40b307c95d2bab56f8dafd2f9c9065dcd25986f82a53