Malicious PDF — malware analysis report

Static analysis result for SHA-256 352360c438e76c63…

MALICIOUS

PDF

80.6 KB Created: 2021-09-17 13:11:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 31b0f6eda31f11a5e218ce1536c67070 SHA-1: bf86834248cdd7d2afc7632005ec040ca7e558dd SHA-256: 352360c438e76c63ec9eca15db7395222e45e994a3bcd14f27d9d71b566062f8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to compromised WordPress upload storage and other disposable hosting sites, likely to download further payloads. The presence of invoice or payment lure language further supports a phishing or scamming objective.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://mfdesign.hu/files/file/xisupisipoxofedosejuderi.pdf In PDF document text
    • http://reyazahmad.bscsaoner.in/ckfinder/userfiles/files/gugirerumifaxivarazekeme.pdfIn PDF document text
    • http://aeon-dev.com/uploads/files/202109031446292928.pdfIn PDF document text
    • http://soskuwait.com/outscapes/admin/ckeditor/uploads/ck/files/86967452806.pdfIn PDF document text
    • http://vocal.bpv.su/content/files/files/52403620728.pdfIn PDF document text
    • http://jezirka-biobazeny.cz/UserFiles/File/58829851358.pdfIn PDF document text
    • http://gongin.humenia.com/upload/userfiles/2021/09/files/210909072359.pdfIn PDF document text
    • http://toanthinh.vn/webroot/img/files/76416835996.pdfIn PDF document text
    • http://dunakeszi.varosom.hu/userfiles/files/bikosimapidajowos.pdfIn PDF document text
    • http://sweepinstyle.com/userfiles/file/26350310817.pdfIn PDF document text
    • http://harnettcountyhba.com/userfiles/file/67164170383.pdfIn PDF document text
    • http://budoprojekt.eu/obrazy/file/72887181616.pdfIn PDF document text
    • http://le-nora.com/userfiles/file/70021045990.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/161414b866f8cb---xutozepa.pdfIn PDF document text
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/79782761268.pdfIn PDF document text
    • http://xn--80aer5aza.xn--19-kmcm3c.xn--p1ai/ckfinder/userfiles/files/duwunurijunivunozonejuj.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16131a54996d0f---78386086574.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613a88f7b00be---64485130320.pdfIn PDF document text
    • http://lmnn.ru/userfiles/file/vujaxiboju.pdfIn PDF document text
    • http://etcpremium.com/userfiles/files/16652139548.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/92140788963.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/wizanuradabelugazemukel.pdfIn PDF document text
    • https://mhreng.com/userfiles/file/27680689783.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=cooler+sh+figuartsPDF 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_off0000d343.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD343 18976 bytes
SHA-256: ac6f3eaf0513f96a1d116fbbaafa3c7520497cf92b39331c9d379464a55eed3a
font_01_sfnt_off00010524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10524 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D3B 10520 bytes
SHA-256: 326230b484a480bdc6e4344ec5c5f2cebd5498f042dc0fc94b80d87fcd25e18d

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