Malicious PDF — malware analysis report

Static analysis result for SHA-256 98760f7eac45c663…

MALICIOUS

PDF

75.2 KB Created: 2021-09-09 14:02:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b989f0fe8fd2cd33c4c4d6e51df21fbd SHA-1: a818aed286c33e7fe2857055698db6a0481ef717 SHA-256: 98760f7eac45c663f6e31b688245932bc3d0e2da435a315a1ecc1f586cb39d1d
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to domains that appear to be part of a link farm or hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or directing users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, suggesting the document is designed to leverage these links for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://queure.ru/uplcv?utm_term=check+ip+address+android PDF link annotation
    • http://marcobernini.it/userfiles/files/tajedafiret.pdfIn PDF document text
    • https://cuacuonbentre.com/upload/files/wororozeliruvelosolixe.pdfIn PDF document text
    • https://cairparavel.ro/app/webroot/files/userfiles/files/demuzewokimes.pdfIn PDF document text
    • https://remont-bez-zabot.ru/files/file/birexoxaruxixubirokifi.pdfIn PDF document text
    • https://maritime-models.com/userfiles/file/pifukasajuvena.pdfIn PDF document text
    • http://9262895.ru/ckfinder/userfiles/files/42273859757.pdfIn PDF document text
    • http://ohdiabo.net/images/ckeditor/files/52632448410.pdfIn PDF document text
    • https://cfi-registration.amyhalter.com/buzzboxgift/img/userfiles/files/sedem.pdfIn PDF document text
    • https://elperrocallejero.info/ckfinder/files/rusodi.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/didiguto.pdfIn PDF document text
    • http://ulv-fogger.es/d/files/33998338367.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/c5tonqkh2co62pd5fkb1uhik85/39782126437.pdfIn PDF document text
    • http://plenaseguroseprevidencia.com/fotosempresa/files/51455400762.pdfIn PDF document text
    • http://chapaconoticias.com/assets/ckfinder/core/connector/php/uploads/files/fibukurijokotopuko.pdfIn PDF document text
    • http://pilanatofishing.com/home/sandbox/domains/shelter.sandbox.tritek.hk/public_html/ckfinder/userfiles/files/18329905385.pdfIn PDF document text
    • http://keralastatetailorsassociation.com/userfiles/file/27378407147.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/xuvupereraruvazadupug.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/b50e900b273966c5d84112541b801273/fukutaboz.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/p3et6nhhs1i3i44u0g901lntru/wiwidajem.pdfIn PDF document text
    • https://loyalangkorapartment.com/userfiles/file/zaxamozikuxode.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/78aa0a7d1724ce2a7b4e9b9aa423f7e7/tolise.pdfIn PDF document text
    • https://ezgoe.com/10005001208290177/ckfinder/userfiles/files/xavagupukekataxorezove.pdfIn PDF document text
    • http://timocomputer.cz/files/file/74287068722.pdfIn PDF document text
    • 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_off0000c5b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5B4 10588 bytes
SHA-256: 4f0663cbe6c242f7cefb1672a6c5849012d6cc3d064fc8e61f238e9fb6f9d3c5
font_01_sfnt_off0000ddd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f5e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E7 16164 bytes
SHA-256: ed25db58d8039332cbb6ca4c9f57b176fc986e39a9bea03c03e9c9f20d957c3c

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