Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a0f55564a902816…

MALICIOUS

PDF

82.3 KB Created: 2021-08-05 20:22:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 06852d94b0c9923eabb17b73118a74a2 SHA-1: dc5d794239b46f709c1a4ece7052fea0a40f100c SHA-256: 3a0f55564a9028166084a53ae6d453f060182635282afc348bce6439166c5114
96 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to compromised WordPress sites, indicating a link farm or distribution mechanism. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the structure and numerous external links suggest an attempt to redirect users to malicious content or for SEO poisoning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • 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://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/dec042151c62e9dac24f4972389c9791/73508324996.pdf In PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609736ea4a48f---ginuwimedonuwebin.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160a0254ecee4f---83169983564.pdfIn PDF document text
    • https://akilanews.com/ckfinder/userfiles/files/72261844119.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210524090237.pdfIn PDF document text
    • https://attack.lt/images/files/rijalosakekuxexojiz.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-7-7/20210707085609965686.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160847c01ee900---42169934536.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/25670722190.pdfIn PDF document text
    • http://haiphongcontest.com/images/files/99489736559.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/cf7ed86953bac3a7deecf4152a3b5aea/jugakukutowozukenemexuxe.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af8e157af11---pobov.pdfIn PDF document text
    • http://finemetal-cn.com/upload/files/tevopilekufageduvuxuli.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/93832991267.pdfIn PDF document text
    • https://www.kcequipment.com.au/wp-content/plugins/super-forms/uploads/php/files/f46cee4e871b7b2e687bf70e1ebc11cc/larirowurib.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/81374674538.pdfIn PDF document text
    • http://bookblog.kr/data/file//files/wubidosoken.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160927346e339e---3427340007.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/644458411a8aaeae65d321c8d579e351/metogelopijotixe.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/4e17c648cb16b9ff556d37fcc88063af/61281268271.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160984bdc9ad39---benina.pdfIn PDF document text
    • http://champaigncursillo.com/userfiles/file/nogefemodoforomif.pdfIn PDF document text
    • https://konyaalotaksi.com/userfiles/file/77787481172.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=summertime+jazz+standard+backing+tracksPDF 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_off0000dd28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD28 17096 bytes
SHA-256: 492e3cca5bfcd2252b27639e91f7d61f2d466a13e19ba3fb70b1528cf66cf3f8
font_01_sfnt_off000109cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121E6 11144 bytes
SHA-256: 4d62aa80d1a3c6a71e9217817f46197347fc007af0829f31cf962753d98c250e

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