Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a6b162e96605db7…

MALICIOUS

PDF

100.6 KB Created: 2021-08-23 22:44:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f68f9d225d824d4c05ab0175b12d6416 SHA-1: 076bd7fff9f4e66fbeb9630f4a8918e2c01fd427 SHA-256: 9a6b162e96605db749576c5d51485a008f1cc0a27212b234c8c25c13c7b8028b
156 Risk Score

Malware Insights

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

The PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to phish or distribute further malware. The presence of these links indicates an attempt to lure users to external, potentially malicious, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

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://naphogacomposite.com/upload/files/6811648784.pdf In PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/d46gq54bb86bfpbbril5bhnpv5/kabuwiburesujas.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/921de671f1801446bbfd5a8266ee56e2/83167333110.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2785482dbc---vapeme.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/aa6b0aee5773aaf6533ab636126c7296/53910968925.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/jenezin.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/tusuvujitegofavatoj.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/f1300gjfkm2q0rbacho10ofv06/17802200735.pdfIn PDF document text
    • http://bigband-ulm.de/userfiles/files/masowijosekagavun.pdfIn PDF document text
    • http://mlkscholarshipsmilwaukee.org/clients/f/f0/f021f13c5c598389be7e913a1ae626ff/File/bumipopebenobimame.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/92ee2b722e84dbad9af216e2aac8451e/58596351039.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/sofilupibupefamipebibit.pdfIn PDF document text
    • https://fl-forever.com/upfiles/editor/files/18567781328.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a779aa812cc---48515103163.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/46023498995.pdfIn PDF document text
    • https://morganmethod.com/ci/userfiles/files/jowulazebazefigimumo.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/5f6c1865cb26a90a400c803d5033be47/kofam.pdfIn PDF document text
    • http://magicdiscoradio.hu/userfiles/file/14159446927.pdfIn PDF document text
    • http://irisapp.cn/uploadfiles/fckeditor/20210710/file/16258604922535.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160941326be2a7---77058782442.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/lunironavuz.pdfIn PDF document text
    • https://www.fyna.com.au/application/third_party/ckfinder/userfiles/files/88278340989.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16078ac1208b75---tojijikufi.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/gatezizaf.pdfIn PDF document text
    • https://rrr71.ru/upload_picture/zaridenepijalugi.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/wikufunapabaxinajem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=end+of+a+sales+pitch+nyt+crosswordPDF 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_off00012195.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12195 10900 bytes
SHA-256: c35b00af23e74be2c0d96f85e503be86e45387d26fe145229b178ed71b609a3b
font_01_sfnt_off00013ac9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AC9 18268 bytes
SHA-256: ef9210fdf420739b007d830ac076e3828507042b0a82b0bf5c94149d556e9b4d
font_02_sfnt_off00016a92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1