Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a99b6e104a106d6…

MALICIOUS

PDF

96.3 KB Created: 2021-07-27 16:01:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: c9ff554fd0d152900637217e8cf6c0c5 SHA-1: dcc55adfefe2f0292b8a975f0a13e55090ac9241 SHA-256: 1a99b6e104a106d6d089dea682c30b1aadb961674fa1b6cba3c90e312c4adcc8
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://thuduchouse.vn/pics/file/ledememaxanesapexitor.pdf In PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16085c8fe96578---lanuxixojunenepakowofomu.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/josategujek.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/oi9i686tm9ulcdged6snhm08ms/zibitejafolakemoxori.pdfIn PDF document text
    • https://cafesca.org/ckfinder/userfiles/files/zikagukobugubiki.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/gmqu4r0u9prdm5tie5hb6bfre4/lebinunet.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/1ce190dc28c6bf976b549286265f9f96/67888689280.pdfIn PDF document text
    • https://tongdaidoanhnghiep.com/app/webroot/upload/files/64010766379.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c56497e92b2---84252466175.pdfIn PDF document text
    • http://villapellegrino.it/userfiles/files/simepipuvowebemoratafa.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/9351683737.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c9a211d07---jovivesi.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607273facfceb---42718078677.pdfIn PDF document text
    • http://sysquare.com/UserFiles/files/jozuvulozunasagezurema.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/panixijapusasokakal.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160930576383b8---45766302218.pdfIn PDF document text
    • http://allg-gyn.ch/userfiles/file/70554130441.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/f4edb964f3e90b8854732e9d08e89f51/zojetezeve.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/93241dc72c580f8a2d60c9dca7086a8e/52349009220.pdfIn PDF document text
    • http://haithuanphat.com/uploads/files/19628179275.pdfIn PDF document text
    • https://nepalimodelagency.com/userfiles/file/xefepakaguw.pdfIn PDF document text
    • https://daismene.it/file/88587641483.pdfIn PDF document text
    • https://t2sc.me/userfiles/xokewusol.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///24404730215.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=how+to+play+baldur%27s+gate+dark+alliancePDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010b75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B75 19272 bytes
SHA-256: a055dd751611d3bee56351bc780842d9d098c849857b75055d2cb473f228dcb2
font_01_sfnt_off00013ebc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EBC 11248 bytes
SHA-256: 5102da2dc3b5bf225603dff485661bc26b8495b15550f18ca8d7d90a6050b0c3
font_02_sfnt_off000158ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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