Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c041ba328ce434c…

MALICIOUS

PDF

88.2 KB Created: 2021-09-07 18:04:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f7d69cc1a72142c979497f596e626561 SHA-1: 28d7c550107f5aa68377bc1e95ac5e7944b7f673 SHA-256: 7c041ba328ce434c2f7b7a631e78c15978190a825b93b17262754f1bfba12051
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The file is a PDF identified as malicious by ML classifiers and ClamAV, specifically flagged as Pdf.Phishing.Trojan. It contains numerous embedded URLs, many pointing to compromised or disposable domains, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://apatity.verlauf-ekb.ru/admin/ckfinder/userfiles/files/vokelemusiw.pdf In PDF document text
    • http://samocvet.org/foto/ck/files/wuvusimur.pdfIn PDF document text
    • https://megatekspb.ru/sites/default/files/uploads/wafesexomazagak.pdfIn PDF document text
    • https://semagro-msw.ru/pics/images/file/wotelofixaxa.pdfIn PDF document text
    • http://biolabsrl.org/userfiles/files/zirotadezudo.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098142dda26b---40369097260.pdfIn PDF document text
    • https://matras-matrasych96.ru/admin/ckfinder/userfiles/files/xesejuririkakiso.pdfIn PDF document text
    • https://laptopserwis.com/app/webroot/media/files/28798723671.pdfIn PDF document text
    • https://avistravel.ro/userfiles/file/81304884501.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/modinidi.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/6bbe0fb33053925503c95dc9f86e23eb/3933814720.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/e5a8ca09bd0b7a5b153163393c1f9b38/kanakibunutugapon.pdfIn PDF document text
    • http://righetti1970.com/clients/872956/File/11249828163.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1607194a8c5c25---28559805862.pdfIn PDF document text
    • https://valubil.com/public/uploads/cms_file/cms_files/99718795597.pdfIn PDF document text
    • https://mountainbrookbuilders.com/home/mountain/public_html/ckfinder/userfiles/files/19067622825.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/1ddb7e7dc19c317dc22d71d29ef9ef83/govalafifojudiga.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/16110c0f0ee09d---zomowufej.pdfIn PDF document text
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/1745895205.pdfIn PDF document text
    • http://gdlejia.com/uploadfile/files/20210822_091138.pdfIn PDF document text
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/fojawidijevonakin.pdfIn PDF document text
    • https://tuttoadomiciliocn.it/file/61770683706.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=negro+national+anthem+pdfPDF 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_off0000f0de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DE 19380 bytes
SHA-256: 742645e53c6b230c841521ce69aa83e51eaf275869bc1030e4daa1d84594d193
font_01_sfnt_off000122e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013afc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AFC 10752 bytes
SHA-256: f9953eb03d612e25a3af173b459855ead61c57646aca87b38894c1f3306530f7