Malicious PDF — malware analysis report

Static analysis result for SHA-256 603b50ae8d657762…

MALICIOUS

PDF

87.0 KB Created: 2021-06-27 12:35:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 700b8aee0812345f122606f8c98e725e SHA-1: 65454a54bf4ff1a53d1469287dc5317b444eb8e9 SHA-256: 603b50ae8d6577627b8f55912627cb9029610a5f90efab426dc7b82bb4b7d087
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous links pointing to compromised WordPress sites, identified as a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were directly extracted, the structure and URL patterns are consistent with malicious PDF lures.

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 http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/688aee2ff133bfbc18014238d419f791/82743376098.pdf
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a5bd73b0d0---57280288045.pdf
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/8950r2rsbt5f1mn1a3uic37jbh/58570863922.pdf
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/943d696feb514896db16215a9178270c/14777420173.pdf
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0aa81ebd31---37084073051.pdf
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/16097c9bfcccba---52348637549.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/bf3ef6e05bb57033033d01ad584bdbb9/tonuvabitifavikiraji.pdf
    • https://harrisitalia.it/uploads/file/16916222453.pdf
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/a5808d3e8917a2462c5e498c50458991/vepopu.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608583be0ffd8---5693175886.pdf
    • http://ats-dz.com/userfiles/file/tivofupekako.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/394c8cfaca112eeba4e85ba0ab12ac4c/zibegilodaxusebuwobale.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606d41fa8a343---98904040711.pdf
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160aab854a06af---mepukilokapakaxote.pdf
    • http://irina-beha.com/ckfinder/userfiles/files/notetixujunowozar.pdf
    • http://www.pranabkumar.com/fckimages/file/luzodizejuno.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/h7hoop9m6kqtknuc3v5hbr5rb4/powodexumopemo.pdf
    • http://akgikorea.com/file_upload/fck_upfile/file/taridiripak.pdf
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088d2ba34c25---82484346445.pdf
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/b87fd86f30f02efb18cc5064a625ea29/4721414755.pdf
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/e3a03ce09c864717e01716e905842102/nosowitatadosa.pdf
    • https://majorsagilekvaros.hu/uploads/file/20916926997.pdf
    • https://kraftyz.in/ckfinder/userfiles/files/49405496164.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=give+two+examples+of+minerals
    • https://medlineplus.gov/minerals.html
    • 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_off0000f32f.bin
d9d4b5c016297f1eafbf825cd6ac47bd5c4341d7f6fd1c758f26f302fe216085
pdf-font-stream PDF embedded font (sfnt) at offset 0xF32F 10812 bytes
font_01_sfnt_off00010c3c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C3C 16792 bytes
font_02_sfnt_off0001244e.bin
9c544524e369849d81fdcb494a8cfd3e3e5557d20682285b83d0db4f5f3fc7c9
pdf-font-stream PDF embedded font (sfnt) at offset 0x1244E 16540 bytes