Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a83babc92eea664…

MALICIOUS

PDF

79.9 KB Created: 2021-09-06 12:54:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 362a16b6ee1a71f95675fa4b020b06e5 SHA-1: b544061ca0047faef6bea6ceedb822facf7a6501 SHA-256: 6a83babc92eea664efb3a9f28c1a9e553cd2c5764827785c6ea09b748d375c97
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this. While no scripts were explicitly extracted, the nature of the URLs and the PDF structure strongly suggest it's used for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://philabc.ru/uplcv?utm_term=histologia+corazon+pdf PDF link annotation
    • http://gibisch.com/files/files/4247661879.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/cb3d55985219d24d7346f80245c806d2/93190443220.pdfIn PDF document text
    • https://martas.vodrsport.cz/uploads/files/wiwukivujevololuga.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed2cb0d6af---vazetiwin.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606de63cb9e1a---52093225213.pdfIn PDF document text
    • https://amoslodge10-org.alljobsinliberia.com/ckfinder/userfiles/files/72923132343.pdfIn PDF document text
    • http://bg104558.agchost.com/userfiles/files/zesov.pdfIn PDF document text
    • http://dsagco.com/Upload/file/90825740648.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc7d7d32981---masazolot.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/4f2ahb5cae1c1rbtbpr2g1bes5/bigedi.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f59d919c7d1---zomegaw.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160b8dc35dcbd0---98627891759.pdfIn PDF document text
    • http://hbleg.com/admin/userfiles/files/52693350470.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160932ef98d59d---60703480370.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/79958060195.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/8907707369.pdfIn PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/46822450645.pdfIn PDF document text
    • http://khautrangkhangviet.com/upload/img/files/37731108188.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16127421c1325b---70040241069.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/32136763567.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c3144eb361f---12228388630.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609685a5752fa---12693079031.pdfIn PDF document text
    • http://chrisdepanneservices.fr/Sites/cds/files/bebitorutudu.pdfIn PDF document text
    • 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_off0000d798.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD798 16860 bytes
SHA-256: 4d56ae83772e00e2ce4b940557f7762686e82ed44fc56d5f4448d60947805c01
font_01_sfnt_off00010348.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10348 10712 bytes
SHA-256: e172eb087e47060cb611bf46b547d11ebfe35dbb2ff6d4be5ee87a948c0048b6
font_02_sfnt_off00011bcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BCC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.