Malicious PDF — malware analysis report

Static analysis result for SHA-256 eed88dede40ae63b…

MALICIOUS

PDF

83.6 KB Created: 2021-07-21 13:46:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d5f004277e7278043d458669d85a1db2 SHA-1: 899f08655a9853f7ee51fcdb713198f860e5d60b SHA-256: eed88dede40ae63b3cfc21b88212b0bd10405254980f82e8d827787ae105eb52
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to obscure the final destination or distribute malware. The presence of external URIs and a link farm structure strongly suggests a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/7dad9e7b5e2c3eb577250c9476b5d1a6/xupozesivexomamepomov.pdf In PDF document text
    • http://veiligheidssloten.nl/ckfinder/userfiles/files/90004134985.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160da7061656d3---rowaduvuvubu.pdfIn PDF document text
    • http://yi-xiang-yuan.com/CKEdit/upload/files/zipubetik.pdfIn PDF document text
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160785379032e7---30434404517.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a213bf89cda---fagokodawelalo.pdfIn PDF document text
    • https://egf.tw/test2/images/file/vemelotusanitopulu.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b6f30c7c61c---muvuwanerula.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160710082ddf0a---98332756083.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/rofewepelopuko.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/24c0e68209a4ee470e1eeeca254d5cfa/tebowugawelisapifesakinav.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a65bdf521fb---wetipalatavu.pdfIn PDF document text
    • http://ashole.hu/UserFiles/File/duwubexuzidodaforulaj.pdfIn PDF document text
    • http://alphaconsultinggroup.us/vpw/images/file/lemajezu.pdfIn PDF document text
    • http://smartpaintingplus.com/userfiles/files/45252209657.pdfIn PDF document text
    • https://penal-garazh.ru/files/92326280895.pdfIn PDF document text
    • http://sumosushingrill.com/uploads/files/fafokobafexer.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0d859e4ac4---xojajubutalafokila.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098441d5085e---88826814713.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/9v3p88e1lljreh1g30eukpr8nm/24908373748.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/213dd50d815f9a71215a8606a26b79ec/vozamawuvugikulonodoba.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9d24c53c0---kanisuwosomelokinabiliki.pdfIn PDF document text
    • http://yilip.net/userData/board/file/fomuduberu.pdfIn PDF document text
    • https://steammining.com/userfiles/file/nibefovetolurafev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=labview+usb+serial+portPDF 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_off0000e6e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E2 10492 bytes
SHA-256: c5ffc19a48647109ef533cb49818ba0c63033c7ac2c513bf91d6ae26b853e0df
font_01_sfnt_off0000fec1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000116d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D3 16376 bytes
SHA-256: 031d5b18a47e8ab45fbffcbcf04fdbb8c3903d13e14c61e6be49006960e3d4f9

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