Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5f486a8bdb8a1cf…

MALICIOUS

PDF

78.7 KB Created: 2021-09-18 20:08:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4e2d4d2c507e3751c13e2198077e477a SHA-1: 6e0d093588fbf1c8ada3b8463b94c9517148f724 SHA-256: d5f486a8bdb8a1cf1f9b7e8c6bfc6d0115270d3bf3a1d3c0019659b9b0f9f497
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a strong intent to redirect users, likely as part of a phishing or malware distribution campaign. No scripts were extracted, but the overall structure and heuristics point towards a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://efficimm.fr/userfiles/files/44675034852.pdf In PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/a31765dab7d2a073c84e85eef1fef8df/71814234667.pdfIn PDF document text
    • http://snft.ro/media/file/rokugasodamavawem.pdfIn PDF document text
    • http://yarpb.ru/pic/userfile/39234256903.pdfIn PDF document text
    • https://giasidaily.com/uploads/userfiles/file/62785618716.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/menoxozibewuze.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/40362171661.pdfIn PDF document text
    • http://chrisdepanneservices.com/Sites/cds/files/xivudomuzelobogog.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/161385f93a3521---zevikitijiz.pdfIn PDF document text
    • https://vaitinhdien.com/app/webroot/upload/files/77435781772.pdfIn PDF document text
    • http://yizhu580.com/ckfinder/userfiles/files/12199114135.pdfIn PDF document text
    • http://thenikharvconsultancy.com/userfiles/file/najowoterupejozu.pdfIn PDF document text
    • http://www.lovebliss.tw/UserFiles/files/bijop.pdfIn PDF document text
    • https://xtrafitcoaching.com/www/images/files/gabosorixukukikizad.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613a4c0237e78---52671715502.pdfIn PDF document text
    • http://brickform.cz/obrazky/files/kunepiwe.pdfIn PDF document text
    • https://jooli.ru/ckfinder/userfiles/files/zexivevojuxobi.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16145c58d669f3---vujapefajivalufelataki.pdfIn PDF document text
    • https://biothiennam.com/media/ftp/file/molefupifiselinorixi.pdfIn PDF document text
    • https://dammesliepas.lv/ckfinder/userfiles/files/92267577425.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/78545714689.pdfIn PDF document text
    • http://homeopathyhongkong.org/files/xakip.pdfIn PDF document text
    • https://xn--80apefbdm9ah5g.xn--p1ai/userfiles/jowigix.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/24112523152.pdfIn PDF document text
    • http://bukharaalpharetta.com/sites/default/files/file/nelijek.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/kalegamisimoro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=gba+file+downloaderPDF 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
stream_005_off000115b0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x115B0 10348 bytes
SHA-256: f4ad094934dc0ac53bcf7fac286ecd4f56b9028cdab1a9396a8c2da98b181000
font_00_sfnt_off0000d1df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F1 17216 bytes
SHA-256: f11d0db9b3d1438af993ea8951728e57533cfe59fc5980766c32f7ba5aa30ebd

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