Malicious PDF — malware analysis report

Static analysis result for SHA-256 781e81b5708f43fa…

MALICIOUS

PDF

85.3 KB Created: 2021-07-03 20:17:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 24c77ee4f8b39f8cd4e827edc6eac21e SHA-1: a469802f877cbb717e63bdd55da567c10e1de15f SHA-256: 781e81b5708f43faf14d357c4f023a774f7bf70ac007f52b0fb12841affe3f80
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://nomylo.ru/uplcv?utm_term=rainstorms+and+thunder PDF link annotation
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/ba02e56736aff8fa2eff2c5239c7acb1/baxewegupana.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/zizadijidijetutibaj.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16098593416e17---zokuserixurawez.pdfIn PDF document text
    • http://bandenplaats.nl/cmsimages/file/luranolipamalami.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/4fccb3acb8cabeb50279929618107f76/62858378723.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160753b93cab11---zojatuki.pdfIn PDF document text
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f671e08f3f---rugiwupifewapux.pdfIn PDF document text
    • http://isgsrl.it/images/file/lekilopepig.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/temebojes.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/1d6ea25e3b0855bfbbd1b570ba998a3b/kegekugubunatixoruxiwomid.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/4c902925404fabd4d41d17483b562ef1/67126669998.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607a47a3998eb---98758917895.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608b791766d31---lezosorefepuwegovejuvovom.pdfIn PDF document text
    • https://0900107678.com/upload/file/kulafuximizoxepikusi.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/somebotopubabilokomutovu.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/ffc4a54c3defded19c7b9261f7dc0b63/41089493217.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210508224612.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6da666383b---71312274656.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/8ed00a2d445213241dc508ab3c7a0f0c/dipediwuwebo.pdfIn PDF document text
    • http://asianaccounting.com/admin/fckeditor/userfiles/file/ruluzezofezeromotu.pdfIn PDF document text
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/382747d0e535e1b9aaa69fdc68830bcd/14386671793.pdfIn PDF document text
    • 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_off0000ec6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010481.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10481 16776 bytes
SHA-256: 3843ffa63e4afeb3b96c9dfbbdecaa8c3ac36247b7f18b1c948ad70ef383384d
font_02_sfnt_off0001303a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1303A 10612 bytes
SHA-256: 5f2c3c644c7a3b631507fbd381b2ddaa2b3475473b3a641633ee5cc1ff1ca4f3

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