Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7285a1ddf38c074…

MALICIOUS

PDF

178.5 KB Created: 2021-06-26 01:33:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e26c629dc60c64859a48756cb0b32b09 SHA-1: 1870ff5eaf138db2033b1ffb4f6d5ad421750743 SHA-256: b7285a1ddf38c07437fe5b97ca553309ca73d1be18006319ab9c29c8facee6b9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting. These links likely serve as a distribution mechanism for further malicious content or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160afd0332ffe2---kovatubavidogagupapi.pdf
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/180911ae8e5c8fb14e5f87d5f8102807/gifoterewemibow.pdf
    • http://hyperasp.net/userfiles/file/xobubev.pdf
    • http://zhengfutz.com/v15/Upload/file/2021512204399300.pdf
    • http://richfield1962.com/clients/4/47/47516dc9824f3897220912ef171c404f/File/46605844863.pdf
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/aed78b13a2ae3a08a92fd5cc17e2a60f/tupawamid.pdf
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/9b8f06b0a733cc1de7a2630d3ac7954a/naviv.pdf
    • http://www.tobywells.org/media/fckdir/file/95653269.pdf
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b9d9737bc9a---somobap.pdf
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160b7626c7ec39---sisor.pdf
    • http://asea-admin.com/_userfiles/file/20210525094304.pdf
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/cfd94660f5b7ebddc41731e92a7cf3d1/63006072142.pdf
    • http://aiswaryamatrimonials.com/fck_uploads/file/taxivuxisiwonip.pdf
    • http://citysuji.com/ckfinder/userfiles/files/voduxazu.pdf
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd4cd24482---tisibojiwumigaxov.pdf
    • http://scbczy.cn/up_files/file/20210616_023405.pdf
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb9a5f20359---reneji.pdf
    • http://eksan-ltd.com/userfiles/file/kutozerezi.pdf
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a137f4d9810---11175318157.pdf
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/gth02ot19rfr5g7gbnnpj2li98/65944366423.pdf
    • http://101-games.ru/images/uploads/files/bilulanuje.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=made+new+in+christ
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00024c53.bin
2930a09e09b61a26f800c3b948d617b7fa9f4419afb4406a25c4785dc4347237
pdf-font-stream PDF embedded font (sfnt) at offset 0x24C53 29504 bytes
font_01_sfnt_off00028d37.bin
d184347ba395f4881c1f8d58fbf942689d8d350fa8ee73baed74df87397c837a
pdf-font-stream PDF embedded font (sfnt) at offset 0x28D37 10380 bytes
font_02_sfnt_off0002a4ad.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x2A4AD 16792 bytes