Malicious PDF — malware analysis report

Static analysis result for SHA-256 2632f3dd5283110f…

MALICIOUS

PDF

84.5 KB Created: 2021-09-04 07:51:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1675e87fb740dac5798b26848e8c0064 SHA-1: e581bf088045b56026a11f1c369e00fb51d60032 SHA-256: 2632f3dd5283110fee5424428379a84430346d9302377db51461182057133226
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised websites hosted on disposable or potentially compromised domains. These links are likely used for phishing or to serve further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://kronospan-mofa.hu/editor_up/kekux.pdf In PDF document text
    • https://knjizara-harfa.rs/files/mumiwevos.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfb884cdb1---kejonowogez.pdfIn PDF document text
    • http://fondationmonetoile.org/clients/0/0e/0ecfe6182781ff486fe5156d2e85c11d/File/vapoberaxabowiwojas.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/28379581400.pdfIn PDF document text
    • http://valkexclusief.reviews/app/webroot/files/userfiles/files/9160195805.pdfIn PDF document text
    • http://petswithlove.com/cvsprojects/SSK/Source/2.0.0/images/files/muwukawe.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dbea72c049---guvovawezupufomenusagidiw.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f603f1e3b---91044357479.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160843957e4339---zefefonasoxikutasu.pdfIn PDF document text
    • https://gastrotest.co/ckfinder/userfiles/files/nemuwamivejuzif.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/55633357919.pdfIn PDF document text
    • https://eletroluz-al.com/_IMG/img_internas/file/lojegewinejujirixufawor.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/pimurukusejavalukapipexef.pdfIn PDF document text
    • http://zonwering-nederland.com/ckfinder/userfiles/files/27258109564.pdfIn PDF document text
    • http://dexgerm.com/data/file/userfiles/files/97798787612.pdfIn PDF document text
    • https://hanahana.vn/media/ftp/file/15568080082.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/tuwiwilepo.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160960a38d6cb7---dijibisugizelokogod.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/fiwarotemepufilizerisod.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160855963aa4dc---vesanima.pdfIn PDF document text
    • http://cbcom.eu/ressource/site-image/files/89849248588.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079ac106d27b---95420181403.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/2kkol2fdbq3gls8r3t01jp4s13/17932828045.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/pusanevazetawusufuwo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=the+tragedy+of+the+commons+pdf+espa%C3%B1olPDF 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_off0000e006.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE006 18472 bytes
SHA-256: 0bb313359818784c101e2a1492a1471befaead13af32c2ff6a0754b0d331cf27
font_01_sfnt_off00010ff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF2 11260 bytes
SHA-256: 887d3fac25d923f08406f7b32c18162a8fd60780699e64c9dc8195c863dd3a76
font_02_sfnt_off000129ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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