Malicious PDF — malware analysis report

Static analysis result for SHA-256 379fe17c1cabaa94…

MALICIOUS

PDF

77.3 KB Created: 2021-09-05 14:07:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 29b3dff8a95ea8b6da66e32982d6d756 SHA-1: 620ea936fd1a3dacac97f323e42c99f73c6d6883 SHA-256: 379fe17c1cabaa94b22b77e0e94b6f3c9933b8254c2b65afd8d079134657039a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm with numerous URLs pointing to compromised CMS upload storage, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the structure and URL patterns are indicative of a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/ie02sjhtrc4oolcvavso8eoqe7/lubojaxizovipumafelas.pdf In PDF document text
    • http://ewinghighclassof1963.com/clients/e/e4/e4cb61fc1babc639533983e887b7272d/File/kogupom.pdfIn PDF document text
    • http://arniuniversity.in/ci/userfiles/files/91095206431.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/gsvrfer6jok82atgb3tg8b1nsa/rujejivulukixinepu.pdfIn PDF document text
    • http://spoanalyze.com/wp-content/plugins/super-forms/uploads/php/files/3a5f70ea3c0571b9efffd783eb74223e/bujolometubinixonu.pdfIn PDF document text
    • http://americanewbie.com/userfiles/file/baliwowabixilekele.pdfIn PDF document text
    • http://renovfab-menuiserie.com/userfiles/file/55990296929.pdfIn PDF document text
    • http://mizuho-co.net/file/ck/files/16921979758.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609a74274653d---buzis.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160fd2971277aa---47528191207.pdfIn PDF document text
    • https://xn--80apefbdm9ah5g.xn--p1ai/userfiles/27067593736.pdfIn PDF document text
    • http://kennedy-jackson.com/clients/f/f7/f78508644b517540cdb1549d93860f53/File/50235629091.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/541oukgd5kelrpf1pe60ta38ik/dizufovizumuxaworixox.pdfIn PDF document text
    • http://flyingkirin.com/uploadfiles/file/301032152011.pdfIn PDF document text
    • https://thietbixaydungcantho.com/canthomobile2/public/images/sanpham/files/55653777569.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/cfff659ef128f4742f696e32491dccfc/21262593117.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee77cd47d6---34643674877.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085f6cb415b7---98582534428.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/beratawafusa.pdfIn PDF document text
    • http://bamor.org/userfiles/file/69531078327.pdfIn PDF document text
    • https://sabagdasarov.ru/upload/file/kifurivesuxotatude.pdfIn PDF document text
    • http://voxel-avocats.fr/uploads/file/sazedaguxexekijilun.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/82902103002.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/zujusekilawisefapod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=herbalife+products+information+pdfPDF link annotation
    • 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_off0000c6e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6E9 18040 bytes
SHA-256: 511a319899c2f27a1c9b354dd5fcaf9f9ef12a0b15eba927fe47bc7d31c674b5
font_01_sfnt_off0000f646.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF646 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E5D 11012 bytes
SHA-256: 8d3e06876d189c391e2a16a122c10e831cc3c6f20e70a8a25b4dea22e5790b46