Malicious PDF — malware analysis report

Static analysis result for SHA-256 08dd44932b3ee559…

MALICIOUS

PDF

96.5 KB Created: 2021-07-18 20:01:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5b38776a78420a8a590519799b76d9d9 SHA-1: 310fcd023522f8ea6d6f59be493da38788bfff34 SHA-256: 08dd44932b3ee559ff9f7fdc56492eea2fa58d0e00bc9557acf27722d872e8f2
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm used to distribute malicious content or phish users. The presence of external URIs and the overall structure indicate an attempt to redirect the user to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://ikuseikyokai.jp/ckmedia//files/74214159970.pdf In PDF document text
    • http://mmbc.cz/_data/user_files/file/51714314264.pdfIn PDF document text
    • http://gojjang.com/uploads/files/vukurapepapopufomobasader.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160862e6867648---18033986030.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/16099f06c221b8---bisizoridadivitun.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/268b84c3af1b7bab333286934995f639/boduxovawezolatelimuded.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7172544c6f---patuzutivozovo.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/16087816acf102---20331299356.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/9949265888.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a2f38c3d721de5b8e01f82a144c95ac7/14033474338.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080b2cae45f1---tevuk.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16077fef4e6013---sitibexenuxafesaxasimede.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/2d6d6640b83a9d0bbee7535f5ccddfce/tibosim.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/daposokivudal.pdfIn PDF document text
    • http://tutek.eu/userfiles/file/9598512583.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/giwonepumawida.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/rafutopavisiwezabam.pdfIn PDF document text
    • https://tvmreza.tv/ckfinder/userfiles/files/kolufolirerefafoxe.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/4b3074e7e7d00bfacfb7e6e89885c814/99720846653.pdfIn PDF document text
    • http://netwindowvn.com/uploads/userfiles/file/mavesolugaz.pdfIn PDF document text
    • https://phuketwebstudio.com/ckfinder/userfiles/files/zitizojosajatenopiluradu.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607da19c990e4---nugofepululutejemi.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/38624061864.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160af5f2bc2acc---kagazug.pdfIn PDF document text
    • http://meechoktoolmart.com/user_img/files/31633269024.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=global+warming+meaning+in+tamilPDF 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_off00011914.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11914 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001312b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1312B 10548 bytes
SHA-256: 94c1eac97402a59a902246a5c44bcdb681695d69793cced1ddca1961f5a83ae4
font_02_sfnt_off0001493b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1493B 16768 bytes
SHA-256: 0771f7317c71759f18e99046f236c481031f54312181e5bfea473eae02ce25b7