Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8c17b18120bc52d…

MALICIOUS

PDF

64.0 KB Created: 2021-09-19 23:35:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 35599e2d39e929d972384ef8df90c6ca SHA-1: 064920b9cabf2a14583a9b1775a7aa40dcd1c5d1 SHA-256: b8c17b18120bc52db9fe25290fa02cb7aa83cdcb154ce734784069461f0b3e1e
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The presence of numerous external URIs, including links to compromised CMS upload storage and link farms on disposable hosting, strongly suggests a phishing or malware distribution attempt. The ClamAV detection and ML classifier further support its malicious nature, indicating it likely serves as a lure to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7597

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://allytemp.ru/uplcv?utm_term=live+streaming+tv+online PDF link annotation
    • http://abwmarlboropike.com/uploads/files/29743045475.pdfIn PDF document text
    • http://kfoodntea.com/dataroom/file/zuvajimajet.pdfIn PDF document text
    • http://schokoladenfontaene.de/idata/6615798673.pdfIn PDF document text
    • http://facyt.com.ar/ckfinder/userfiles/files/padedozopixiduzotibozukud.pdfIn PDF document text
    • https://artenika.pl/fck/file/45882327754.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe562f14d6---8223829800.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/161336d6e0b324---95981229914.pdfIn PDF document text
    • http://haokunchem.cn/upload/files/wugedo.pdfIn PDF document text
    • http://yieldpharm.com/upload/files/kezesugelut.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/01lt56hr73e4rfiv8hg67j0im3/vuwaxubupowavo.pdfIn PDF document text
    • http://k-ookuma.com/js/upload/files/pevajojuludomotalulilefa.pdfIn PDF document text
    • http://castel.lu/userfiles/files/mixavejolelowo.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/tutisarod.pdfIn PDF document text
    • http://trustycctv.com/ckfinder/userfiles/files/83916120184.pdfIn PDF document text
    • http://rintoyo.com/userfiles/file/surolowaregotamilavi.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/8a442ac49672f14f1ea0b123d1fc8641/nebetaritubojodigogu.pdfIn PDF document text
    • https://cargobull.cz/res/file/77389241251.pdfIn PDF document text
    • https://anhhuynoithat.com/asset/files/kobagejavoj.pdfIn PDF document text
    • http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/10407352294.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8531034d0888da2bb9386306ad4f46f0/sananofuruborumodudow.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/66338898339.pdfIn PDF document text
    • https://nieruchomosciturystyczne.eu/files/file/3763743295.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/10698299123.pdfIn PDF document text
    • http://beautifulmoda.com/userfiles/files/38465014275.pdfIn PDF document text
    • http://matchedtubes.de/userfiles/file/nilulatevawopazosipo.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C1 18340 bytes
SHA-256: eb1a73b367e19612d04afd28c9e61a67c1c9c0af05f55209c5d178bca9346379

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