Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3dd015c8a65d030…

MALICIOUS

PDF

70.9 KB Created: 2021-09-05 01:30:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 62a6b1cc26581bc15431ab1b464ed78b SHA-1: 6e14370d17a54e242d8372a244b74f0729a630e0 SHA-256: c3dd015c8a65d0301ba277baec4646c1004cd0dd9ae1679e2dc87342865585ef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggest a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious intent, likely involving the redirection of users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://dycelife.com/userfiles/file/muzabovozon.pdf
    • http://abwlondonblvd.com/uploads/files/85348494268.pdf
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/itkl61qfgn1hbkc5b525if0js4/30354422785.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/31b8e7eb3e971313e0510df5535ea22c/gogonukilifefizekagepuw.pdf
    • http://szentistvanpatika.hu/upload/file/99865365656.pdf
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc1a0e7463---xesegofezubi.pdf
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160966db22e502---54082662429.pdf
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5bdbabc08---22894324315.pdf
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077f108c540c---satagax.pdf
    • http://pampa.be/uploads/userfiles/files/74498969145.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee2e395194---1909875320.pdf
    • https://asiajitutop.com/contents//files/wigelubibavevufevexufiro.pdf
    • http://amctop.com/board_data/editor_img/file/202106281917.pdf
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/c6dca00b29c13d667752133c201b15ba/68755031971.pdf
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092eb69748d2---43330146985.pdf
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/30bcc2bd3719b587bd83b288ce5fb6a5/70069047424.pdf
    • https://sp-pir.ru/wp-content/plugins/super-forms/uploads/php/files/f6d0399560b3c8a712ba2c2992e24c91/xitadodawujiniwodovubojot.pdf
    • https://cfacgroup.com/uploads/FCK_files/file/fijik.pdf
    • http://www.taimaobi.com/admin/ckfinder/userfiles/files/99845785199.pdf
    • http://jrpst.pl/userfiles/file/41644742510.pdf
    • http://pomocnaukowa.net/Upload/file/26570194377.pdf
    • http://eatoceanic.iorderfoods.com/uploads/files/54658229985.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=hoover+power+7+total+home+manual
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b33b.bin
9e7ffc0ff190b066a3994ee37c53d812f21435cd0df07aa72795b4c4b51aee01
pdf-font-stream PDF embedded font (sfnt) at offset 0xB33B 16720 bytes
font_01_sfnt_off0000de33.bin
59688bdef1fb7d90e77bfbf116f7361f6f1734aaab7224fb5e75ff613c999b1b
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE33 10548 bytes
font_02_sfnt_off0000f61a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF61A 16792 bytes