Malicious PDF — malware analysis report

Static analysis result for SHA-256 7591976c635d20bf…

MALICIOUS

PDF

84.1 KB Created: 2021-09-08 06:14:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8676964105e8335054307163cfb76132 SHA-1: afe5799386c6f73714b1c22772453fa91787c97c SHA-256: 7591976c635d20bfc3822e2507426961a3f1e1fc37f86562ef51f3f09b32f4ba
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 identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's used to distribute further malicious content or phish users. The PDF structure and embedded URLs are consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://pcccmiennam.com/media/ftp/file/fodaparaxapuf.pdf In PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdf0011139---39880901251.pdfIn PDF document text
    • https://uppersanduskyrotary.com/cms/files/File/69214752778.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b18f250972---zaboparaf.pdfIn PDF document text
    • http://donovaly-ubytovanie-safran.sk/web/userfiles/file/vuluxaba.pdfIn PDF document text
    • https://economiadecomunion.com/ckfinder/userfiles/files/gokorijenudaxomezexeri.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf694b7df7---96065044663.pdfIn PDF document text
    • https://klairtransport.com/uploads/files/95190372938.pdfIn PDF document text
    • http://27derajat.com/assets/ckfinder/core/connector/php/uploads/files/57880813659.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608390c4cd659---kelaxikoxibizipowifijusox.pdfIn PDF document text
    • http://fields-on-earth.com/images/blog/file/pusebuxutizenut.pdfIn PDF document text
    • http://kubablimel.pl/Image/files/kanozufukopi.pdfIn PDF document text
    • http://inercial.es/uploads/files/59375921983.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/23050406338.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bc91e8a3b61---mefafagobadituke.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/evawisojureregopajuri.pdfIn PDF document text
    • https://sanmuabancongty.vn/images/content/files/zazekenebarabotox.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/77250695371.pdfIn PDF document text
    • http://dh-life.com/ckfinder/userfiles/files/64825069934.pdfIn PDF document text
    • http://cnwt.mgo.cool/upfile/files/2021/08/25/7813890584.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608061dea6cc8---panoxilid.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/76926625858.pdfIn PDF document text
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/160745426889d3---tilumevofasowolotokopilen.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/58847032987.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/au3jg1a0d8kj2kuf94v6mu569f/22791490400.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=yapay+zeka+ile+ilgili+makaleler+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_off0000e393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE393 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fbaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBAA 10600 bytes
SHA-256: 08ca84cf99292e55d534d7c27ad668b6b6caa58d2d06418e9c6d4802e268b33f
font_02_sfnt_off000113aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113AA 19144 bytes
SHA-256: f259cd6e7e0f4499076f61f0e7ba83f108fbcffcc190550fdbf095ffc3b15675