Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d0a7dd132abbbef…

MALICIOUS

PDF

77.8 KB Created: 2021-10-06 03:24:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 24d48e23663b0dc007775e3b31c74f58 SHA-1: c4f783ae6f586b3c0ff0913dae945598815ef353 SHA-256: 2d0a7dd132abbbef541c28eea36c19fcbfc7a4bb933a00815e665472a980312d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. Multiple heuristics indicate the PDF contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution attempt. The presence of embedded URLs and the overall structure strongly suggest this PDF is intended to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://drafthe.ru/uplcv?utm_term=rice+sized+worms+in+cats PDF link annotation
    • https://menu2uplus.com/images/file/75499923268.pdfIn PDF document text
    • http://www.diplomat2014.ru/ckfinder/userfiles/files/sezusaxedapilutov.pdfIn PDF document text
    • http://lighthouse-connection.at/myPix/file/71824521349.pdfIn PDF document text
    • http://htygroup.com/upload/files/bolejore.pdfIn PDF document text
    • https://mundolibre.cl/uploads/userfiles/files/9604143784.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/tftb8ieps9tue13l1hkkp9gp65/85188349768.pdfIn PDF document text
    • https://sunsetlearningcenter.com/userfiles/file/furofala.pdfIn PDF document text
    • http://quetthe.com/upload/files/mafekito.pdfIn PDF document text
    • http://jjkxmy.com/upload/files/202109161611216784.pdfIn PDF document text
    • http://kolbiko.com/images/uploads/file/97594778250.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1615ce6bb498b8---sikokuposob.pdfIn PDF document text
    • https://sd-olimp.hr/files/dirilevaxovageso.pdfIn PDF document text
    • http://www.mmd.ntou.edu.tw/ckfinder/userfiles/files/potugizazamolokatusur.pdfIn PDF document text
    • http://abwmarlboropike.com/uploads/files/gigatazunoweroxexevud.pdfIn PDF document text
    • http://duet-czluchow.pl/userfiles/file/waxepujevazojurobuwa.pdfIn PDF document text
    • https://hotelcorona.ro/files/1684795248.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/kasawunofoxorajabiver.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ddb52bda5b---sajirupuxilirutazegem.pdfIn PDF document text
    • http://systempro.kr/userData/board/file/45359280033.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/45490391148.pdfIn PDF document text
    • https://csmgh.net/pevron/www/img/file/kulopoxoparoga.pdfIn PDF document text
    • http://boldogelet.hu/media/zizigize.pdfIn PDF document text
    • https://krassimirtaskov.com/userfiles/files/sarovudemupof.pdfIn PDF document text
    • http://mayinluatudong.com/uploads/userfiles/file/melikage.pdfIn PDF document text
    • https://permargi.com/files/galeria/files/gebaviwolopu.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_off0000ccb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCB8 10676 bytes
SHA-256: 203487187d160e0c8e7e6f296b9822278b8676f89932af4ebebc8cb27126f573
font_01_sfnt_off0000e554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE554 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD66 17340 bytes
SHA-256: d778824640fa703a78fda6510d9b65dde5999f08fe93fa3e6afa178e7b5a2b54