Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dcb168dbb02f7f6…

MALICIOUS

PDF

102.0 KB Created: 2021-08-03 13:03:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ee345f42a1e22ebd7442e3f832efb838 SHA-1: e6c93258c87b65a9210947e99e4d3cd302087e00 SHA-256: 8dcb168dbb02f7f64ab05d4bd932431dc2819de23ddf10008d1c4f8c74c67883
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://henca.com/files/details/file/wepamimegisabitinotepul.pdf
    • https://kawanmto.net/contents//files/19274653098.pdf
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5a0b9a3103---folujokitodekebipalobepa.pdf
    • https://almuhja.net/ckfinder/userfiles/files/95910977849.pdf
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab2263456db---88422370205.pdf
    • http://strandedtattoo.net/file/8779992441.pdf
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160993364a8a4c---nivelefutufolivaromo.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/pften5gtnkhi7o0qv4aoabajj6/pozimujori.pdf
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16075abffc6c5a---ralizeluduwotunufusul.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160954df2a6dbf---limitobasibajufi.pdf
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161046d67ac189---wofanegikabag.pdf
    • http://accomplishtheimpossible.com/userfiles_ati/file/12176969133.pdf
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4fd2b183eb---50302979297.pdf
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105d41fc1fe1---39170708682.pdf
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2b34cb0b7---56601753356.pdf
    • https://seerupit.dk/assens/file/89182581149.pdf
    • http://jagodkaprzedszkole.pl/userfiles/file/pesutorifinemi.pdf
    • http://mgocsm.in/userfiles/file/25467025922.pdf
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/acb25bdad42e32d8e0c00dd7e4b35459/medogasipusozexowi.pdf
    • http://www.allatpatikapecs.hu/images/file/96265317947.pdf
    • http://indemo.pl/Image/files/gonitaxobo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=programme+d%27entrainement+musculation+sans+materiel+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000129fd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x129FD 16792 bytes
font_01_sfnt_off00014214.bin
4a6c178f62099819636fdf18bc870ff2f452434c85ab50d18d99741c03314440
pdf-font-stream PDF embedded font (sfnt) at offset 0x14214 11100 bytes
font_02_sfnt_off00015bd2.bin
6d1205e2c96e3c1a9cff9c3f5f85d1f957a3d59fcc040c4210a788efacb9e2a5
pdf-font-stream PDF embedded font (sfnt) at offset 0x15BD2 17884 bytes