Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfbdc7ad3e418920…

MALICIOUS

PDF

69.0 KB Created: 2021-09-27 16:19:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 59f710045873acf5b6ecb711fbb40686 SHA-1: 58495b88501109ab29949773011f74bde5718f13 SHA-256: cfbdc7ad3e41892096adb0b90b20b7d073898ff4981d9b9113b6f273d4831a46
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing or malware-hosting sites. The presence of multiple external links and the 'link farm' heuristic suggest a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://siamsnail.com/media/userfiles/files/luzebexulasor.pdf In PDF document text
    • http://www.anclupnapoli.it/userfiles/file/pixaloseriwedi.pdfIn PDF document text
    • http://deborahmayerlawoffices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/winilox.pdfIn PDF document text
    • http://tznjl.com/userfiles/files/lamoxunin.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/0sbmuuktrmojpec3jj2m6u5hnh/bizateripalututexa.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/8dl53aovr1qkda1cd75l7ejrb1/81887573505.pdfIn PDF document text
    • http://live-lessons.net/lcj/web/uploads/assets/file/wazojuwux.pdfIn PDF document text
    • https://tjpapigroup3.com/contents/files/kinupolutowavulozoda.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/najumoxomarokatez.pdfIn PDF document text
    • https://golf-tout-terrain.com/publish/page/file/rasorovovidu.pdfIn PDF document text
    • http://stamforgtechnologies.com/uploads/98237793042.pdfIn PDF document text
    • http://tractortools.cz/ckfinder/userfiles/files/vuxaxixalesalepor.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/80f8vk2v0lmml73cr9g3lshqeq/35793502450.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139c5d362b7f---14211806991.pdfIn PDF document text
    • http://telektrans.hu/editor_up/gelaruvimazotovadofepek.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/fdkhfoa5thpmgsr807uqmq4gr2/nexutu.pdfIn PDF document text
    • https://detskeihriska.eu/ckfinder/userfiles/files/51942846237.pdfIn PDF document text
    • http://ty6600.com/userfiles/file/53382816474.pdfIn PDF document text
    • http://stonepigments.com/userfiles/file/tomomumima.pdfIn PDF document text
    • https://zapret-rf.org/web/img/podborky/files/96686972788.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/82013305480.pdfIn PDF document text
    • http://ceroki.com/image/files/xagepuvinawi.pdfIn PDF document text
    • http://sportservistocik.cz/UserFiles/File/zibozev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=move+to+ios+for+androidPDF 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_off0000b0d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0D6 10360 bytes
SHA-256: 986faff16b39a32955d14a8c47b2964ee541f132b600d6d2b86fe9f5a55bc06c
font_01_sfnt_off0000c870.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC870 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e082.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE082 15196 bytes
SHA-256: 577fef1e0fdde25ac105b1bcd927b6d3b7cb1690afcbebe0f7ab429fc59ca60d