Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b683fcfdd7776b9…

MALICIOUS

PDF

60.9 KB Created: 2021-09-07 23:46:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: e389de9b12d3f9861183f98a00d23f23 SHA-1: bac5cda99e380c313be024f7f134f2577cd3519a SHA-256: 7b683fcfdd7776b9aad0132787c0bebb0521e04ad5d99abedd1e838f274189a8
154 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised WordPress uploads and disposable hosting, likely intended to redirect users to malicious content. The presence of multiple external URIs and link farm characteristics strongly suggests an attempt to lure users to external, potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7193

Heuristics 5

  • 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
  • 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://markmont.eu/editor_uploads/system/files/razuwopes.pdf In PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16070f2781b85f---68087330873.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d4ab3c26f02---68754342566.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/05/24/file/20210524_093233_123.pdfIn PDF document text
    • http://fuoriscena.eu/file/69955876692.pdfIn PDF document text
    • https://topplene.com/upload/ckfinder_temp/files/20210613153535.pdfIn PDF document text
    • http://bitree.net/ckfinder/userfiles/files/84782962928.pdfIn PDF document text
    • https://festival-bg.com/media/ckuploads/files/40300897118.pdfIn PDF document text
    • http://smingames.com/ckfinder/files/6759874153.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/dufer.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/1t9esnge8ihl9emuun0jsmgq84/6082870168.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5870a1961f---1243970272.pdfIn PDF document text
    • https://chuyennhakienvangvn.net/upload/files/gevikomirukumuposarofitub.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/zuxojobevuviwativ.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1610d0efc5856c---88365411123.pdfIn PDF document text
    • http://pmmagic.vn/userfiles/file/waxovutuzanenefaxiju.pdfIn PDF document text
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/kulusizudigekidebodi.pdfIn PDF document text
    • http://www.bongbansaigon.com/uploads/files/kuwuxiwakub.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf8ff15b48---91462632873.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/76m38o7umua2fq882tli6qbb2k/danikewo.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608d534164206---1347639620.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c1af62b0ee1---34751716740.pdfIn PDF document text
    • http://ezibra.pl/upload//file/sisemuzinukalanetexi.pdfIn PDF document text
    • http://kraski-chernila.ru/resources/file/vajisujufoxoremola.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=percent+increase+and+decrease+word+problems+worksheet+with+answersPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1