Malicious PDF — malware analysis report

Static analysis result for SHA-256 810d75d874f45cdb…

MALICIOUS

PDF

83.9 KB Created: 2021-09-04 21:36:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e9a68aa43b39c17b490464ac60a95724 SHA-1: 7aad1e7864cb58f34a4c6036ca886d5f52e2169c SHA-256: 810d75d874f45cdbc22f3af2d3782be7528ef9095dc6f10cbf04d80bd8344757
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites used for hosting PDF files. The presence of 'utm_term' parameters suggests an attempt to disguise the malicious nature of the links and potentially track user interactions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://hillcresthigh1971.com/clients/9/9f/9fbf9047a6869172a982db6f42f05a9a/File/jivupis.pdf In PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074d3d50077a---xekutoralizubusofujib.pdfIn PDF document text
    • http://studioego.cz/userfiles/file/vuvamiw.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/c3ff72f06af3ba92eabfbbcf37bbaa41/rusili.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610caae278de6---44471807384.pdfIn PDF document text
    • http://urjabatteries.in/userfiles/file/40276540603.pdfIn PDF document text
    • http://modellszerviz.hu/userfiles/file/guxeb.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4c6574255---wifebugi.pdfIn PDF document text
    • http://esistore.be/userfiles/file/boxiseditojusikedijo.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/qetv9206hml290uctlvl0371o1/tabuwedenax.pdfIn PDF document text
    • http://startmatbaa.com/userfiles/file/walivebelog.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160a391af5cb14---sutemonevitepot.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/bfjhrrkdelid3re85ngq4l5d21/97086947761.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/56e7789f7f080af195c9a3468559af1b/59850559584.pdfIn PDF document text
    • https://tylbm.com/Upload/ckeditor/files/dexovupivopefaximenewoj.pdfIn PDF document text
    • http://canadapremiumlubes.com/survey/userfiles/files/992130809.pdfIn PDF document text
    • http://architettoseneca.com/userfiles/files/nokelo.pdfIn PDF document text
    • https://presstone.hu/userfiles/file/26204573168.pdfIn PDF document text
    • https://volnynaklad.cz/data/file/84437735860.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/67374694054.pdfIn PDF document text
    • http://thepducphat.com/upload/files/reton.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096a51a66223---96051176155.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/ca2fc9d854968e56ba10d0855880dba2/55948169636.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5e1f6a3a8---ninete.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=seborrheic+keratosis+bad+pdfPDF 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_off0000e47c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE47C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC8E 17064 bytes
SHA-256: 17d9cc8405f08b8deb0ec23646a07f6a6fbbce6e5afb5dbbf728528965019592
font_02_sfnt_off000128a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128A4 10872 bytes
SHA-256: 73b868e99d0b587e626455c1a70c89a1b256770c8028738b788223d92dfbd20e

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