Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf19895e49f48748…

MALICIOUS

PDF

86.6 KB Created: 2021-09-18 08:11:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cfeb4c2595fc7b87d661446da17c377f SHA-1: 504bcf855116abc6b086abbc5ee79b4482a51281 SHA-256: cf19895e49f48748d43ae544407b6b1374c545126b7d9ac58988bb3b48896d35
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure and URL patterns are consistent with a link farm designed to lure users to malicious content.

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://nomylo.ru/uplcv?utm_term=streaming+dont+breath PDF link annotation
    • http://marine-inox.com/i/File/30664366983.pdfIn PDF document text
    • http://nachhilfeschule.havonix.com/ckfinder/userfiles/files/moxodezukejatuwedepagixi.pdfIn PDF document text
    • https://5uempat.com/contents/files/tulapapi.pdfIn PDF document text
    • http://neoneofitou.com/ckfinder/userfiles/files/54641077272.pdfIn PDF document text
    • http://cherryontop.pl/upload/fotki/file/14557405736.pdfIn PDF document text
    • http://around-sicily.net/userfiles/file/nawuvukix.pdfIn PDF document text
    • http://totoumi.jp/upload/file/zamujebafulen.pdfIn PDF document text
    • http://apcmagon.com/userfiles/96604078620.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/ir2mncojh3549bm9esmactub9h/39060703666.pdfIn PDF document text
    • http://rvhifi.cz/files/file/1807665084.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///41521356716.pdfIn PDF document text
    • http://nhabe.com.vn/ckfinder/userfiles/files/zawetu.pdfIn PDF document text
    • http://danies.ru/ckfinder/userfiles/files/nalagokajuxetopu.pdfIn PDF document text
    • http://www.kymenhome-etsinta.net/tiedostot/files/46144601872.pdfIn PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210902145254.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/161370792d8cbd---51857926037.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/94643629720.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16133817eea3fb---21221619233.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134e3036865e---20052340178.pdfIn PDF document text
    • http://szjwwj.com/userfiles/file///zagexeragin.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/xefexizele.pdfIn PDF document text
    • http://e-menu.hu/editor_up/8973829355.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613998f88b699---lalavenegapugajiwunori.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/53616214470.pdfIn PDF document text
    • http://makaroma.fr/upload/file/jedegojevinopujorob.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_off0000eba9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA9 10696 bytes
SHA-256: bbf8fc9602b040c7ca620a361d0d9476499965cd1fbfe9da24223dcbc9e66b4e
font_01_sfnt_off000103c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C1 18960 bytes
SHA-256: beb7614d9c236718c16b6f3ec7f394bcc7c4b5c208164035c73a7024407dc106
font_02_sfnt_off0001346c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1346C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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