Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fa5f0491b455e3d…

MALICIOUS

PDF

80.7 KB Created: 2021-09-17 22:15:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 56176143e1f39b80f599215d9777a532 SHA-1: cb73bf4ed923cf06755861408f202bd66529b015 SHA-256: 8fa5f0491b455e3d42df88edf5a05c71a3dbad130bdc6a84a73e9903d9fb95cc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The presence of embedded JavaScript and a high ML classifier score further support its malicious nature. The primary goal appears to be directing users to potentially malicious external sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mufoxipusozetige.pdf In PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/161401eef4df49---20211752026.pdfIn PDF document text
    • https://ilexgold.com/app/webroot/files/userfiles/files/notejebadetawujodidage.pdfIn PDF document text
    • https://wotfiles.com/ckfinder/userfiles/files/3380386516.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/tatanetojijuko.pdfIn PDF document text
    • http://poliinc.com/upload/files/nonawus.pdfIn PDF document text
    • https://membermimpi.com/contents/files/18572292231.pdfIn PDF document text
    • http://www.cpiequipos.com/assets/images/user_files/files/95117741936.pdfIn PDF document text
    • https://fceresources.com/ckfinder/userfiles/files/17117272717.pdfIn PDF document text
    • http://phongkhamthienhoa.vn/images/files/kimixal.pdfIn PDF document text
    • https://chachachat.info/js/ckfinder/userfiles/files/zukufowamulenanezexiwa.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/kowikabidewosusipi.pdfIn PDF document text
    • http://parcroyale.hk/userfiles/44347217882.pdfIn PDF document text
    • http://nitecoreromania.ro/files/file/60133229635.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d8fae0fa60---10650661663.pdfIn PDF document text
    • https://evpersoneli.net/ev-personeli/file/89745056354.pdfIn PDF document text
    • http://cafesezony.ru/fck_editor_files/files/musotozarigelilokifedaz.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/281b856521e6a474d7fcfc9a8470bc8f/37130134022.pdfIn PDF document text
    • https://doctornhospital.com/banglanews24/editorsfiles/files/88235694105.pdfIn PDF document text
    • http://misterholidaysanprisco.it/userfiles/files/fisozijifati.pdfIn PDF document text
    • https://khmernative-rice.com/userfiles/file/giwakavilerozobumevowibov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=style+writing+copy+and+pastePDF 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_off0000ce65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE677 20764 bytes
SHA-256: 348044bc4ce1e2b1024ddc3a99650381c78a06d8bbcf99aaac51940e9a30f2f1
font_02_sfnt_off00011c16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C16 10964 bytes
SHA-256: 1b99077750cff7529d014727c1612132e880863451dffe3c8c4e02569b50d802

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