Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfdae32254ea3edd…

MALICIOUS

PDF

92.5 KB Created: 2021-09-20 04:47:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 56c90f2d0c97592c8b6e192e9a7adbad SHA-1: f5c220a14a9af0e6544fc07d338886d49a8c3933 SHA-256: bfdae32254ea3eddcac1c8c458f104e20ad9d669f0f45d09c378a07c105638bb
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple compromised CMS upload links further supports the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://ketchas.ru/uplcv?utm_term=latest+free+movies+online PDF link annotation
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/ahq97flsv9htle7e0j9v17pedp/mozizasim.pdfIn PDF document text
    • https://techinnsrl.com/writable/public/userfiles/file/dosexanagakanitipazuluvog.pdfIn PDF document text
    • http://szhlfz.net/upload/jiravetojosalubaledubaj.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/torobevagepigawezapud.pdfIn PDF document text
    • http://jezirka-biobazeny.cz/UserFiles/File/68073251793.pdfIn PDF document text
    • https://dianthusindustrial.com/resimler/files/mamixowidezawulixepafi.pdfIn PDF document text
    • https://www.newhorizonscrisiscenter.org/ckfinder/userfiles/files/rosasozejusuxuludidukubo.pdfIn PDF document text
    • https://abicecream.ru/ckfinder/userfiles/files/94611323704.pdfIn PDF document text
    • https://marblobaths.ph/app/webroot/img/files/risokobozeduvokol.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130d7a9da1d7---46918040281.pdfIn PDF document text
    • https://duhocblueocean.vn/ckfinder/userfiles/files/litizapasigam.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141e6535e42d---20335420593.pdfIn PDF document text
    • https://music-group-store.com/upload/files/ledabowi.pdfIn PDF document text
    • https://netron.pt/app/webroot/media/files/kunexepapiwuwitagugipuxi.pdfIn PDF document text
    • https://tomas-music.com/contents/files/89512694763.pdfIn PDF document text
    • https://ripedzn.com/app/webroot/files/fckeditor/file/sugizexitupobetumiludut.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/72503182535.pdfIn PDF document text
    • http://www.tecs4.com/intranet/ckfinder/userfiles/files/rararited.pdfIn PDF document text
    • http://xn--b1adrijbbb.xn--p1ai/upload_picture/varorix.pdfIn PDF document text
    • http://britishcytology.org.uk/ckfinder/userfiles/files/lajamuwuzibuve.pdfIn PDF document text
    • http://tomaszskiba.com/userfiles/file/dozedezataziwet.pdfIn PDF document text
    • https://e-ssuances.com/ckfinder/userfiles/files/33755262009.pdfIn PDF document text
    • https://goodmix-psc.com/userfiles/files/84186967839.pdfIn PDF document text
    • http://hstechno.com/userData/ebizro_board/file/89846817059.pdfIn PDF document text
    • https://auditorescr.com/ckfinder/userfiles/files/36436934751.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_off000107c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C2 10396 bytes
SHA-256: 6917d3c256ec2b4b93d77c5fcc72110e8dcc3da0ef609c005f2d931e5e771b41
font_01_sfnt_off00011f4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001375e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1375E 17228 bytes
SHA-256: 766cbbd45e8a5e5c8c1ee3d9227e733e007cb576b0deb638fb2486ad61198716

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