Malicious PDF — malware analysis report

Static analysis result for SHA-256 4418c51d55fd8dcd…

MALICIOUS

PDF

75.5 KB Created: 2021-09-04 06:07:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 70136af2e9a8604191b9cff10bc6bf19 SHA-1: 3a8a679c5b995da04205b1330887b18dbd31d383 SHA-256: 4418c51d55fd8dcdd5a89b62e7dfc6c0bde77ba4134181c94493c84bbc0a5ab7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised websites and disposable hosting, indicative of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are sufficient to infer a malicious attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pistant.ru/uplcv?utm_term=trixie+belden+the+secret+of+the+mansion+pdf PDF link annotation
    • https://sedefartphotography.com/resimler/files/70283371519.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160ab5e74be5a2---57307250009.pdfIn PDF document text
    • http://kahounova.cz/userfiles/file/jilabo.pdfIn PDF document text
    • https://tahitotfaluovodak.hu/ckfinder/userfiles/files/gizepitovegiv.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160abbe5dbdefc---basaz.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/1445111800.pdfIn PDF document text
    • http://absigorta.com/E/file/79546735424.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/pepuxowufilonon.pdfIn PDF document text
    • http://di-tech.kr/fckeditor/userfiles/file/gavoxixijejisulumudil.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16095bd14e9777---86577677478.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/fuzumirejitojot.pdfIn PDF document text
    • http://srcchaika.ru/files/uploads/files/jagosexibirulatojoguvux.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/59af295f24daae849ffede40f4bd451b/95780300876.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16095cf6e57b42---zojexama.pdfIn PDF document text
    • http://studiotecnicodama.it/userfiles/files/63508260462.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0556414d8---porabutevakatodepofutodif.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4b59d22717---buduf.pdfIn PDF document text
    • http://blfimmobiliare.com/userfiles/files/vezitubuzanixevafulobomu.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/161064a7e7f877---4213964325.pdfIn PDF document text
    • https://rdsdealers.com/ckfinder/userfiles/files/70245307267.pdfIn PDF document text
    • http://kath-kiga-bw.de/bilder/berichte/file/68005334290.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_off0000c530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC530 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD42 16360 bytes
SHA-256: 7e85a28acbbe35fc1ae01d91182fde31e227c84fd501b1e49b6826c67ee8f2c9
font_02_sfnt_off0001075c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1075C 11092 bytes
SHA-256: a6024a6acc3f1e2c0858577b57facc52a98804196a0f9bfbd588f5be13fd74d5

Open this report in the interactive analyzer, or submit your own file for analysis.