Malicious PDF — malware analysis report

Static analysis result for SHA-256 151a02aeb0aa699d…

MALICIOUS

PDF

85.0 KB Created: 2021-10-07 05:27:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 348ae70247dfd465a9285efa24f885a7 SHA-1: 9100f26d0fdace30dd855549fb1c6f4af044ccdf SHA-256: 151a02aeb0aa699d56a1d954717a0c6a4696a8d911799916a3e1e96d079b2cbf
156 Risk Score

Malware Insights

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

The PDF contains numerous external links pointing to various domains, many of which are identified as compromised CMS upload storage or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, but the structure and URL patterns are indicative of a link farm designed to lure victims.

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 https://irlanc.ru/uplcv?utm_term=ulysses+poem+by+alfred+lord+tennyson PDF link annotation
    • http://rosniyom.com/userfiles/files/sogiwagafoxasanetitugar.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1615a8713dc640---4283646935.pdfIn PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/batixonufazusuramugidiwes.pdfIn PDF document text
    • http://airsoft1.ro/files/file/wotuwokaniruz.pdfIn PDF document text
    • https://feltshoe.com/userfiles/file/25413328050.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1614caf486ec9a---xejifitudirovabomurimi.pdfIn PDF document text
    • https://officialbacknumber.org/editor_up/36975814320.pdfIn PDF document text
    • http://palami.by/images/file/maviliziwogonuwotinufu.pdfIn PDF document text
    • https://nexusmediation.nl/files/5146087455.pdfIn PDF document text
    • http://perfekt-dom.pl/designhome/admin/userfiles/file/69358395704.pdfIn PDF document text
    • http://diagcorlifescience.com/attachment/file/16922853686.pdfIn PDF document text
    • https://dortmundpools.com/contents/files/xovedonuliwavurifaputiwi.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/161596de0967bb---gimagumeg.pdfIn PDF document text
    • http://stellarvvv.ru/ckfinder/userfiles/files/21765333559.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/lokewapipa.pdfIn PDF document text
    • https://taxforce.nl/userfiles/files/gikumixapulunudakamog.pdfIn PDF document text
    • http://chamdure.com/DATA/files/37830310190.pdfIn PDF document text
    • http://hferrynetworks.com/FileData/ckfinder/files/20210902_21CD5C8C6EF9A0C6.pdfIn PDF document text
    • http://problemconsulting.com/img/download/files/meripimarilojobob.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/lokekelaturetorovapolina.pdfIn PDF document text
    • http://s2ipower.com/survey/userfiles/files/duwavafogamiteweboxevemi.pdfIn PDF document text
    • http://dblbtech.com/userfiles/file/7112808387.pdfIn PDF document text
    • http://www.ville-dammarie.com/ckfinder/userfiles/files/pezemulefaxuvekalenarizaj.pdfIn PDF document text
    • https://tanthueviet.vn/img_data/files/36026995701.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_off0000e568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE568 18572 bytes
SHA-256: 7c7be2c8537c33d68e2afaa579b624cedf6979b50a34100fb72697964ba7a8fd
font_01_sfnt_off0001150f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1150F 10828 bytes
SHA-256: b2238ec1d1450d04e63106c0ed3a25a84f99f85c836c68402457ce0c96e963c3
font_02_sfnt_off00012dd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DD1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1