Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2167b57458d8786…

MALICIOUS

PDF

72.7 KB Created: 2021-09-26 04:44:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 25a5d2cd39bd6dedd9c31d6a85a59811 SHA-1: ebbb5432d688d5e13cf47b7950ca51289c098ea7 SHA-256: c2167b57458d87866821d47d754ea528af7925544bcf5cc7323ebb72eebd10cb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of link farms designed to obscure the final destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery through these links.

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://gaziogluenerji.com/images_upload/files/99213001498.pdf In PDF document text
    • http://tns-china.cn/editor_upload_image/file/jugutinupowotefixabimu.pdfIn PDF document text
    • http://oxigensupplies.com/shipinc/userfiles/files/lonuzukinovilojazal.pdfIn PDF document text
    • https://ceccargiurgiu.ro/userfiles/file/rujajadeturiganolalu.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/54641667776.pdfIn PDF document text
    • https://ozora.schaffsen.com/contents/file/dubejobemakanofigilub.pdfIn PDF document text
    • https://igk-lilienthal.de/downloads/91787367322.pdfIn PDF document text
    • http://curvesncontours.com/userfiles/file/xekebekuxudadil.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/zijonomilexazik.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144b58c7f71d---jolonadunopakebozafel.pdfIn PDF document text
    • http://akatumusics-ang.communication-pro.fr/public/1283/contenu/file/77893333819.pdfIn PDF document text
    • http://goksirlambinowice.pl/img/upload/files/lojexoxumebitanibulagenow.pdfIn PDF document text
    • http://ediliziaunoaventi.com/userfiles/files/zoronurenosefusoba.pdfIn PDF document text
    • http://shijijiaming.cn/filespath/files/20210913211233.pdfIn PDF document text
    • http://accronline.com/userfiles/file/zigawanabenunejotaj.pdfIn PDF document text
    • http://campingwithconvenience.com/files/files/67699493127.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/161410f4b49ec3---34483285614.pdfIn PDF document text
    • http://gardena.crazyrockinsushi.com/uploads/files/9134934416.pdfIn PDF document text
    • http://oticonshop.net/ckfinder/userfiles/files/wopokosekuxilofufod.pdfIn PDF document text
    • https://www.natursany.com/ckfinder/userfiles/files/18420354369.pdfIn PDF document text
    • http://thebankcardservices.com/uploads/files/sarazadavunubitowid.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/a2803244ea2521eac3ee77d3e46a88b0/26470003787.pdfIn PDF document text
    • http://zatacorp.com/upload/files/89924565808.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/65cb1fa0063601ab93343f25e099baea/pibewojew.pdfIn PDF document text
    • https://arbormaster.net/uploads/files/salepanexadanutubawetazas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=64+in+1+android+game+apkPDF 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_off0000b51d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB51D 10716 bytes
SHA-256: cae15c3cb825115251f1ea38d6fe32d6e020b6f395676f553e464ad2717c0851
font_01_sfnt_off0000cd82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD82 18420 bytes
SHA-256: 1cad50f366d8367249bfcc170d7bb7a4fff43d361ecb45c3d359412ef44870d6
font_02_sfnt_off0000fce6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1