Malicious PDF — malware analysis report

Static analysis result for SHA-256 9da044ce2a58dae9…

MALICIOUS

PDF

87.2 KB Created: 2021-07-25 18:51:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: db430c6dc5af5a54bda52c554f57efd3 SHA-1: b84874e91bc019698cea1e8630cb3686b45a20ac SHA-256: 9da044ce2a58dae9a1f5acfb56c3ef96a6d02cbf77b06d1dbdc0c8cd9a0e32fc
176 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating it is part of a link farm, directing users to potentially compromised websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The embedded URLs point to various domains, some of which are associated with compromised WordPress installations, indicating a common tactic for hosting malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://elsekmont.eu/userfiles/file/13652333817.pdf In PDF document text
    • http://9meclinic.com/ckfinder/userfiles/files/pobudojajawewezebosago.pdfIn PDF document text
    • http://www.dreamstoreonline.es/ckfinder/userfiles/files/zedinagevavigo.pdfIn PDF document text
    • http://hongphuc.vn/userfiles/file/38361413248.pdfIn PDF document text
    • http://hiddenforrest.net/clients/76790/File/rudado.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/258cc4e1ecba1ad7efc2509749b6a16d/pamivod.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6ceac1886---73029222386.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/0nr48bivracf29ancsj09uk39u/radevezafuxo.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/65792778149.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160862c3611eac---70908536480.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b67ff3f8de---jabawajakipivom.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609099ce631ef---96081405930.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16072c2cc01aa8---bowazubizugaxitojebofuf.pdfPDF link annotation
    • http://hwayinn.com/image/files/20210626_012252.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/gofobovevera.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/3559274247.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/ae74c02cee9e2bd740f8c95e4a0e1b6c/gokutotupebafit.pdfIn PDF document text
    • http://hsound.ro/images/custom/file/34457309291.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/labavowasorulotasow.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/18349273524.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e434d4957d---32805516790.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f51e43ff6---pawibep.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609dac2d65e25---vinorusopezerobew.pdfIn PDF document text
    • https://appvid.eus/userfiles/files/refutudoritefujuwomof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=tig+welding+techniques+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_off0000f419.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF419 16192 bytes
SHA-256: bc265625286c72781e2dec4c5491f8ffaa64452528f654cd60b0b9b25c001a60
font_01_sfnt_off00011e2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E2E 10812 bytes
SHA-256: f349b3193b70c265a54ea2e21d8bdceb87e0776d1dd0cc726d1309bd8bac3802
font_02_sfnt_off0001368e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1368E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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