Malicious PDF — malware analysis report

Static analysis result for SHA-256 2344e1e87009d2a5…

MALICIOUS

PDF

87.6 KB Created: 2021-09-04 10:11:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f453bb3afc6f55f0e12c9c76dc5cb1b7 SHA-1: 474ab8a2c5b34777c437710aa8e57f9f82add9ec SHA-256: 2344e1e87009d2a590973bd46442cc3f1abc3d25b23e7adf33215fe1c6b02cfb
64 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a link farm pointing to numerous external URLs, many hosted on compromised CMS platforms. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting and UTM parameters, suggesting an attempt to manipulate search engine results or redirect users to malicious content. No scripts were extracted, but the presence of embedded URLs and the link farm structure strongly suggest a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3031

Heuristics 4

  • 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://medvor.ru/uplcv?utm_term=simulation+modeling+and+analysis+pdf+descargar PDF link annotation
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/16084a18279806---3343474904.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-5/20210505155902448730.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/25fae2a07022173aa6cfdb66559a741a/jupikagir.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/jamadi.pdfIn PDF document text
    • https://hockeymro.ca/docs/file/63037563410.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/eb340f3be5414c774d090fd51e377ba5/78659217602.pdfIn PDF document text
    • https://citytrafik.nu/images/file/21744311113.pdfIn PDF document text
    • https://thinkhigh-tech.com/d/files/deporikejuroja.pdfIn PDF document text
    • http://thehedgerowchronicles.com/ckfinder/userfiles/files/35639734914.pdfIn PDF document text
    • https://samowar.ch/upload/file/21706879339.pdfIn PDF document text
    • https://clubesolbra.com/uploads/files/ritufu.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/turenodejosaxese.pdfIn PDF document text
    • http://xn--e42bt3l.net/upfile/files/90797704494.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1621281527.pdfIn PDF document text
    • http://dsm-trhs68.com/clients/8/81/818e764d3414495a915a5f66638dc9bf/File/suxozegisego.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607814d54369e---73639035001.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082710218a09---15773128715.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/vv7i9nk1qo4ol35gpelmq7u10b/mirupowuwabad.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca95a9475bb---57733097974.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/t80erie1unk1sthnr69df89ov7/40646566236.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f634d385a67---naredu.pdfIn PDF document text
    • http://archgeo-leszno.pl/uploads/userfiles/files/melos.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f3189abfcc9---6326483890.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000116d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012ee8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EE8 11252 bytes
SHA-256: 7ba1faae6f890b90240bfe4fd0ab5a4593b847c4a429d537b1722f073eb3f3de