Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0a47870c4ab9eb3…

MALICIOUS

PDF

70.8 KB Created: 2021-09-07 18:58:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 84ee8a757469692180d4266bc84bf003 SHA-1: 432bbe076cb7b3c3ebd108547e268b18ec6a217c SHA-256: e0a47870c4ab9eb3b6a74b68de788f370b80a7bfa06e284522de04ce8c7a19de
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous URLs pointing to compromised websites, many of which are configured to serve further PDF documents. This indicates a link farm strategy designed to distribute malicious content, likely for phishing or malware delivery.

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 http://assushop.com/userfiles/assushop.com/file/86516107682.pdf In PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/0999782e455d6b63837c0d947f04f06b/zekezatumi.pdfIn PDF document text
    • http://hosteleriayvending.com//ckfinder/userfiles/files/marufugitu.pdfIn PDF document text
    • http://emeat.ru/var/files/fetojakazolu.pdfIn PDF document text
    • https://pmapmc.com/userfiles/image/files/42425612287.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6bc0fb3312---mabelexokivelavat.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1608904bd71a02---kijanebobijegotulukur.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c02ea04047---44763351075.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/92b16b88090df6d70dcf68a1834f705e/gewifemu.pdfIn PDF document text
    • http://brenna-ski.pl/userfiles/file/faxesegofubewezugozet.pdfIn PDF document text
    • https://rawoctane.com/uploads/file/50769460899.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dda1fcc94c---mizavipedenakudutedirep.pdfIn PDF document text
    • https://menuiserie-sainte-anne.fr/userfiles/file/fiwomipixuganotut.pdfIn PDF document text
    • http://szentistvanpatika.hu/upload/file/kodadosotitukev.pdfIn PDF document text
    • https://zohopin.com/calisma2/files/uploads/46626663160.pdfIn PDF document text
    • http://erpsamik.com/ckfinder/userfiles/files/31130320790.pdfIn PDF document text
    • https://atvatextile.com/upload/ckfinder/files/42404233366.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/b1bdd4768bec4c2210501623b3c53679/14106019764.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/fajugoruzek.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/zexiworuropitekofedosa.pdfIn PDF document text
    • https://ideylia.fr/uploads/file/pirumes.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/zekiv.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-6-28/20210628223324951386.pdfIn PDF document text
    • https://rasathantrananotech.com/ckfinder/userfiles/files/danisum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=sap+basis+basics+pdfPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/50a20d3e38a88131cdeae0f461a42b30/48993538997.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_off0000b615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB615 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE2C 10228 bytes
SHA-256: fbf89bfd2b05d77eff5d320d7fad3ac2e37e176ddf43ca345b581d927fb9e731
font_02_sfnt_off0000e4ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4EF 16228 bytes
SHA-256: 2d2dc75c35a2135cb89fc7a0f5af901240e23044745f1a720e6a3925d894d467