Malicious PDF — malware analysis report

Static analysis result for SHA-256 f80f76f493448f2c…

MALICIOUS

PDF

70.4 KB Created: 2021-09-30 16:33:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 001aec35e128b93c9c2b124af95822ce SHA-1: 13574895bd4d4abcae35cf7faa60aa9ddf5f9690 SHA-256: f80f76f493448f2c413eb664fb44ccc2fec2389084ea0f596c1cccff4b776076
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents that may leverage embedded JavaScript for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://gopherandsquirrelcontrol.com/admin/images/file/81374585676.pdf In PDF document text
    • http://stensoproject.com/userfiles/files/69522941993.pdfIn PDF document text
    • https://digbijoynath.in/uploads/userfiles/files/jiwoditorufafebet.pdfIn PDF document text
    • https://essaidafm.com/uploads/FCK_files/file/56044991976.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613880c23aff6---7861413887.pdfIn PDF document text
    • http://elma1.ru/!upload/files/kegeli.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613978053bed8---50496499692.pdfIn PDF document text
    • https://jobtiara.com/files/files/tijawof.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/r1q9hpgrr22c3b602pigup0953/lenizedapino.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/nutet.pdfIn PDF document text
    • http://xn--b1akwe.xn--p1ai/userfiles/file/20896612173.pdfIn PDF document text
    • http://eco-versute.com/app/webroot/ckfinder/userfiles/files/sabewirosekolevalevato.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1612efe52ce59c---botumofepozibiratuniw.pdfIn PDF document text
    • http://designerhouse.ru/upload/files/33989323762.pdfIn PDF document text
    • http://geluidsadviesnederland.nl/ckfinder/userfiles/files/wasexazelikiwiba.pdfIn PDF document text
    • http://pcserviszlin.cz/ckfinder/userfiles/files/79378063862.pdfIn PDF document text
    • https://rmp-traueranzeigen.de/cms/files/xevefuriz.pdfIn PDF document text
    • http://aleshashop.net/uploaded_files/userfiles/files/xezidupekitirikepumusuma.pdfIn PDF document text
    • http://briquettemachinery.com/d/files/69456644521.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/79706457246.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161410d8a00f84---pipalajitajuvi.pdfIn PDF document text
    • http://vstarmp.cn/upload/files/20210917_005500.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/95107652342.pdfIn PDF document text
    • https://mamadona.ru/ckfinder/userfiles/files/89601988053.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=the+treasures+of+mystery+island+walkthroughPDF 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_off0000b3aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBC1 11156 bytes
SHA-256: fe1998a01bc7cead6d0ae7a911eb35b4c0564cfb634101d47f4c40e5119a3270
font_02_sfnt_off0000e583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE583 15016 bytes
SHA-256: 688b6669ae82a5bb888c4653e3e084f6e752795a5b267c77cadf917af0c1d302