Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c68a50b5162bec8…

MALICIOUS

PDF

87.2 KB Created: 2021-08-21 13:46:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bd88868a9d6ec7c17ce5b74f2fa1f19d SHA-1: a12622f6af70b63dd50cd676c8147c6e684a0c83 SHA-256: 8c68a50b5162bec8aecb0bb14b5401d8e3b29ae0258ad6270beba285ba436f69
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links, many pointing to compromised WordPress sites and other unknown domains, suggesting it functions as a link farm to distribute further malicious content or phish users. No scripts were extracted, but the structure and URL patterns are consistent with phishing or malware delivery campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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 https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090f6d7327e2---72555012564.pdf In PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/riwiberapelorul.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/9krrevjqn8psi4ervrsr35ji4g/96828635048.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16098772d5684d---4791291983.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e29212fae---11925090970.pdfIn PDF document text
    • http://bosch-service-center.ru/uploads/files/duvajolikisaxugavaru.pdfIn PDF document text
    • http://kaushalacademy.org/ckfinder/userfiles/files/4098609080.pdfIn PDF document text
    • http://abpaluso.com/upload/file/fomoxala.pdfIn PDF document text
    • http://garmagostaran.com/Upload/file/30590122836.pdfIn PDF document text
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/dinebu.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/e57da18b0fe4b2dc9cbb20a14dc65edb/nitazawafazid.pdfIn PDF document text
    • https://propactionvehiclesuk.tv/userfiles/files/mawiredubomuvogegabi.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd26084592---20389778564.pdfIn PDF document text
    • https://prawobrzeze.info/userfiles/file/99513469915.pdfIn PDF document text
    • http://rebeccafantarchitetto.it/userfiles/files/69275798439.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/4a5c02ad7a6454276a229156747b04e4/5378629992.pdfIn PDF document text
    • http://teenaramainc.org/clients/875997/File/24159269677.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160901fb921962---fukariteze.pdfIn PDF document text
    • http://maradonasalud.com.ar/ckeditor/ckfinder/userfiles/files/38537128578.pdfIn PDF document text
    • https://cmflower-kkc.com/ckfinder/userfiles/files/89661511165.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/dorasugamanus.pdfIn PDF document text
    • http://korealabels.com/ckfinder/userfiles/files/taludamigedoxawiveginogax.pdfIn PDF document text
    • https://trimix.bg/UserFiles/File/tulosoveture.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+change+munchkin+diaper+pail+bagPDF 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_off0000f282.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF282 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A99 11200 bytes
SHA-256: 145117cfcb6e1ef3104a8c26c2b3e82ff86a13fe22f392192356e102560547ca
font_02_sfnt_off00012424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12424 16216 bytes
SHA-256: 333da7f50563b51fc2ef023a59edaaef1f2d077ae8cb90a25aef840920e5a034