Malicious PDF — malware analysis report

Static analysis result for SHA-256 df322cc8e698cc99…

MALICIOUS

PDF

74.6 KB Created: 2021-09-21 05:15:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 17dd250af123d62c13fb1518bce0ab11 SHA-1: dc409c72cfca962b018760f1dc3499d04fe442c0 SHA-256: df322cc8e698cc99342eeb19ec2561752a3c93312cd9d56245014c201dae4dbd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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=ley+de+gauss+pdf PDF link annotation
    • http://baracenter.be/userfiles/file/41651180856.pdfIn PDF document text
    • https://jaukiaplinka.lt/ckfinder/userfiles/files/18797172029.pdfIn PDF document text
    • https://acrgruppe.de/userfiles/file/6369321346.pdfIn PDF document text
    • https://daulte.com/ckfinder/userfiles/files/kupobalad.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16148efe083d27---90891430488.pdfIn PDF document text
    • http://wittymall.com/multimedia/userfiles/file/vezelumiwosaraleb.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/xetin.pdfIn PDF document text
    • http://aapltd.net/userfiles/file/mipefopinozisiresedugomi.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/49289434759.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/f53e983f393bea1b65fe54c0bedcd995/31730920368.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/040gfl9mcgh7q3n36f5ep0a8i2/60261967765.pdfIn PDF document text
    • http://worldsocialistpartyindia.org/ckfinder/userfiles/files/wovibamezadin.pdfIn PDF document text
    • http://www.rupankar.com/fckimages/file/lewapudiwowigozalonar.pdfIn PDF document text
    • https://ijpdua.com/contents/files/padanub.pdfIn PDF document text
    • https://ispartaorganizasyon.com/ckfinder/upload/files/25975761020.pdfIn PDF document text
    • http://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/87337339985.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/73923450639.pdfIn PDF document text
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/rulikiwupajudilegujuxe.pdfIn PDF document text
    • http://pokebarslo.com/uploads/files/52182897625.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/75e6a9a163912b1fbb838b286d623174/funametupeli.pdfIn PDF document text
    • http://zekejozsef.eu/FCKfeltoltott/file/28796283064.pdfIn PDF document text
    • http://thainightjob.com/ckfinder/userfiles/files/ribiribi.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_off0000beb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEB6 18584 bytes
SHA-256: 36f1ff621b5e141ba504c2ea2e2640aa784f01162d171674c2de4c606e46e7ae
font_01_sfnt_off0000ee66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001067d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1067D 10284 bytes
SHA-256: 81d93ce9995108935a67ed5b66201cd3f23a5eb8d9ed2a5a42b9febee2b9f556