Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8b34214b4cebbf4…

MALICIOUS

PDF

74.0 KB Created: 2021-09-14 09:50:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a7642806d639445522d6621eaa4aa438 SHA-1: d437054d269f2902ce86f8200f23428ea9a1bffc SHA-256: c8b34214b4cebbf4d98a0265f7ecbdb9248c56ddbca28a8854383a793b02eee6
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://sdv.sk/userfiles/articles/file/85911329691.pdf In PDF document text
    • http://prime42.ru/userfiles/files/121441585.pdfIn PDF document text
    • https://xn--80aaijzh9b.xn--90ae/documents/file/28768703930.pdfIn PDF document text
    • http://motivationandmomentum.net/ci/userfiles/files/64292077565.pdfIn PDF document text
    • http://soc-in.com/data/media/files/xakopi.pdfIn PDF document text
    • https://portalbime.com/UploadedFiles/New/file/91230477950.pdfIn PDF document text
    • https://twinslock.com/locktactyuma/userfiles/file/85506879979.pdfIn PDF document text
    • http://polaryachtmanufactory.com/res/wysiwyg/file/wetamil.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/51102098939.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/09/06/file/20210906_014602_137.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/16135248e97021---gekapeviragufejere.pdfIn PDF document text
    • http://harmonie-avion.fr/actualite/files/34750242059.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/84052215497.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/98849199119.pdfIn PDF document text
    • http://www.majbrno.cz/uploads/files/92470510727.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/8p6vvg3plo1nurjg8qfmc09qk5/57997973051.pdfIn PDF document text
    • https://infotechloyalty.com/bot/ckfinder/uf/files/kuwaderenepuxikagafajikar.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/iodsa1dj3c4r8qmfr36pfsstfc/28808257877.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/75291644137.pdfIn PDF document text
    • https://www.le-domaine-de-hauterive.fr/ckfinder/userfiles/files/76063327848.pdfIn PDF document text
    • https://cupanghitam.com/contents/files/bizofomofawikipifesu.pdfIn PDF document text
    • https://czus-lukasa.sk/userfiles/file/rilonipisumotilepod.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/m9mn105f034e9jgrovddsjq05a/38951587568.pdfIn PDF document text
    • http://zhfangyuan.com/uploadfiles/files/seruderipe.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613f8258dc563---vokesigedezazag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+copy+files+using+total+commander+androidPDF 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_off0000b72e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB72E 11252 bytes
SHA-256: bed74249cef46ff0f47cd51339e3807704cb9661468b0aebac92bc07569447d1
font_01_sfnt_off0000d15f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD15F 18960 bytes
SHA-256: 89d505d9a516702020bb0859618ebeb50658dd35ef908a94c567c8c3868ee4a2
font_02_sfnt_off00010230.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10230 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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