Malicious PDF — malware analysis report

Static analysis result for SHA-256 986a10abad1190c9…

MALICIOUS

PDF

83.8 KB Created: 2021-09-05 12:14:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 86676d7fb88253c9167c0820368a3223 SHA-1: f58daec4b00dbdc4cd82afb05ef5765c44a2fa0f SHA-256: 986a10abad1190c90afe9db69d67673fac9ba8f804ee9f9ba3d2e065ba68ff10
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate it functions as a link farm, directing users to multiple compromised WordPress sites and disposable hosting domains. These links likely serve as a lure to phishing pages or malware downloaders.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://hanifeugur.com/image/files/80365309210.pdf In PDF document text
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071789cb7bcb---21520524268.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2b67b72348---radav.pdfIn PDF document text
    • http://aotwresort.info/ckfinder/userfiles/files/42070636115.pdfIn PDF document text
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/92v33gfg610qlsa0j724bm3qoj/gomawiwoxebutebuwudon.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160c04ab5bcca9---bofadelufijovizise.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/taralodutozotemugile.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160accf38ad2a3---95131051879.pdfIn PDF document text
    • http://hms31.ru/img/file/70441347575.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b0ddc7c506d---pezikobatekewufim.pdfIn PDF document text
    • https://giustofiori.it/file/wofudelabesijo.pdfIn PDF document text
    • http://condosworld.com/abisol1/userfiles/files/vadox.pdfIn PDF document text
    • http://vuatoyen.com/uploads/userfiles/file/wonupoturi.pdfIn PDF document text
    • https://csn-alliance.com/data/files/losuwalifanafupuje.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/54092997405.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/n3gdt25umfp1ruhgta9q8814lt/47594193758.pdfIn PDF document text
    • http://sattamatkapatti.com/userfiles/file/posepufejugaw.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b54254c0e2f---xobiwarov.pdfIn PDF document text
    • http://bavlas.lt/ckfinder/userfiles/files/15078280892.pdfIn PDF document text
    • http://zekidilektekstil.com/images_upload/files/96160358321.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e97c6354b9---631352958.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f268795410---pupesipatuza.pdfIn PDF document text
    • http://maszyny.pl/userfiles/file/30409211255.pdfIn PDF document text
    • http://hillsdale66ersreunion.com/clients/c/c6/c679c52642bc64dd8629b98fb95ccc77/File/54103524591.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=cause+and+effect+worksheets+for+autismPDF 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_off0000e21f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE21F 11004 bytes
SHA-256: 44b818db4e357c20f82768d023337e03feffe575430ad32c6cb61fd8e4d1c8b1
font_01_sfnt_off0000fb9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB9C 17772 bytes
SHA-256: 0db4cdbb36dfb595c80f98cd555da73c791e5b2cfed6a984020975c9cafbe54f
font_02_sfnt_off00012983.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12983 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1