Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fdd0d7e79800438…

MALICIOUS

PDF

78.2 KB Created: 2021-09-01 16:58:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d00534cb5656d33b46a8d858cc1b68cf SHA-1: 849f4be42433feec1b8ebf9d3660c28696a14aa5 SHA-256: 7fdd0d7e798004381218730c7a91664081945b712780419bbc915571fee05a66
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicative of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 https://defi128.phpascal.com/userfiles/files/30993956957.pdf In PDF document text
    • http://ozari-ua.com/files/file/movawonu.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608038b446617---rawafopu.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/51392463452.pdfIn PDF document text
    • http://monroehighbeachreunion.com/clients/8/88/88bd109b8fc96949fe6caf7698e88fda/File/bezaluwomizog.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/u0v7g0da5ik9tr1bhhc3pi2kdu/35663302495.pdfIn PDF document text
    • http://nicolalazzarotto.com/userfiles/files/zokamepot.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160abc93b6b1d9---setagewiw.pdfIn PDF document text
    • http://a-mega.ua/images/uploads/file/72779560487.pdfIn PDF document text
    • http://inciboya.com/resimler/site/files/54389569667.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/69624051492.pdfIn PDF document text
    • https://moolans.com/uploads/files/kumekovurilugupekutuniluf.pdfIn PDF document text
    • https://ijfbacknumber.com/editor_up/53792448556.pdfIn PDF document text
    • https://shibbirs.com/media/files/voremeru.pdfIn PDF document text
    • http://qianxish.com/ckfind_image/files/darudugijavudebumetej.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/57901371520.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16074ac76dd49e---85441093556.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/4m5lqrsfrklph58n8gi1emgql5/wavobigugojulikaganu.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/6c77dc5e4899166cbf60fb48fdce1e0d/gegulobepi.pdfIn PDF document text
    • http://nissanotogovap.com/uploads/images/files/toxisopuleva.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/2211a7b66352b9fc0207e4d1c04281a2/30282327976.pdfIn PDF document text
    • http://ansatrans.ru/admin/ckfinder/userfiles/files/wixuzejuluwif.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16083db5b87bdb---17725998275.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=time+place+and+cause+conjunctions+year+3PDF 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_off0000cbd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBD0 11156 bytes
SHA-256: 779870a55ea0e7c060a639542edb79b9d481ff1b4a923ec03e74e5b1a431079f
font_01_sfnt_off0000e5e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E4 17220 bytes
SHA-256: 0e2055ffd3f20daf06979f41cd3f119db84b41eae72202e95228567f58bdae09
font_02_sfnt_off00011275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11275 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1