Malicious PDF — malware analysis report

Static analysis result for SHA-256 231b74f9e3a0d1fd…

MALICIOUS

PDF

73.4 KB Created: 2021-10-07 01:03:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b4d4647902e66a68c5cdfe8b4e9cf0ae SHA-1: 47e435bfed3de62e63c4352cf9f990e5edb16414 SHA-256: 231b74f9e3a0d1fdd3b83a827f05a06dc9d167dbbf8e199e86635d2765925169
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links pointing to other PDFs hosted on various domains, many of which are identified as link farms on disposable or compromised hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://evrokomplekt.ru/userfiles/file/44630647664.pdf In PDF document text
    • https://whiteplacard.com/UserFiles/file/50592856457.pdfIn PDF document text
    • https://conexkarvan.com/cache/fck_files/file/xaxewofafiwaxuxuvikosu.pdfIn PDF document text
    • http://kerekesvillszer.hu/UserFiles/file/mozurulot.pdfIn PDF document text
    • http://goldendoodlesofthesierranevadas.com/userfiles/file/vekutazepu.pdfIn PDF document text
    • https://izyskately.ru/foto/ck/files/54497710973.pdfIn PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/26584060209.pdfIn PDF document text
    • https://www.vita-organic.eu/admin/ckfinder/userfiles/files/13524533604.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1612eae90df460---kibepaponaledutu.pdfIn PDF document text
    • http://thailaundry.com/imgUpload/files/gedezotupusitazezi.pdfIn PDF document text
    • http://eotp.info/sites/default/files/fck/file/xorawezarifukerapetafe.pdfIn PDF document text
    • https://transmilenio.net/datamont/userfiles/file/demanisuge.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1695a5fd6---51682567503.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16151a25de0beb---kopezegedibipolemigavo.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/dujalegupi.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/26723599032.pdfIn PDF document text
    • http://ore-processing.ru/d/files/lowukuredivut.pdfIn PDF document text
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/74037199408.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb14aa0e90---23283497982.pdfIn PDF document text
    • http://avvocatoandreabruschi.it/userfiles/files/jiwewipanego.pdfIn PDF document text
    • http://knx-shop.ru/admin/ckfinder/userfiles/files/44969315278.pdfIn PDF document text
    • http://china-guolin.com/filespath/files/20211004015343.pdfIn PDF document text
    • https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/dukomajidodesofibowobu.pdfIn PDF document text
    • https://profix.fr/ckfinder/userfiles/files/72779217100.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16146fd60dd793---71436008415.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///dawazug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=buchholz+relay+is+used+for+the+protection+ofPDF 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_off0000bf46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF46 11044 bytes
SHA-256: 7a52cdc0fc5fba4f4c99c9e0dd7909fdbcf42c3435d79660d7fd646d61e81069
font_01_sfnt_off0000d909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD909 15208 bytes
SHA-256: 7b1e0bf45500938c12cfb2da5fa0587a4e6a251b5096b303614d51e46973d31e
font_02_sfnt_off0000ff6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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