Malicious PDF — malware analysis report

Static analysis result for SHA-256 99acb8b90555fbad…

MALICIOUS

PDF

82.5 KB Created: 2021-09-02 09:56:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c6d73a8aefe3b111499727304655304f SHA-1: 3c7d41b9395bd07ffd0f25b0e86e2bbb1341b198 SHA-256: 99acb8b90555fbad002f009c956394909ec28807f69ae1dbc70d9714578e4bc7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution intent. It functions as a link farm, containing numerous URLs that redirect to other PDF files hosted on compromised WordPress sites or disposable hosting. The primary purpose appears to be to lure users into clicking these links, potentially leading to further malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 https://medvor.ru/uplcv?utm_term=fed+and+feed PDF link annotation
    • https://stmpallet.com/ckfinder/userfiles/files/81397057720.pdfIn PDF document text
    • http://slp61.com/clients/e/e2/e296dcecfd7d10ffef0cc83fef253c72/File/wodutipafizizujafereda.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/68a76dbded79ff00a50ea35c5ec8d840/senuzofibojerizerab.pdfIn PDF document text
    • http://ahrestygz.com/userfiles/files/20210816_120354.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/c69085052a06a7e6b176bea7e0c86e56/72067944126.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/63q93m5dc3352n0ev3g4i2n1hp/zezijus.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160be724db3ef4---24487985313.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/jn12m2chhbjtnguoi8hu23vkv1/91035439653.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/sakefixuzumuzosigov.pdfIn PDF document text
    • http://luatsubienhoa.com/upload/ck/files/29973129342.pdfIn PDF document text
    • https://nepalmicrofinancesummit.org/userfiles/files/50321112034.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d0e327ab90---wojodi.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1610a46ae368c4---tuvivunuvanaf.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/58548881756.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1609a6bce131fb---givifozemibenu.pdfIn PDF document text
    • http://faceconnects.com/ci/userfiles/files/wadukatevifup.pdfIn PDF document text
    • https://www.savininkai.lt/ckfinder/userfiles/files/serirom.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16071e29e64ebe---40469517216.pdfIn PDF document text
    • http://candientushinko.com/images/file/poxotewupinuboxuxoxazuwix.pdfIn PDF document text
    • https://vibangthuaphatlai.net/uploads/files/40505114509.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/fuzabara.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16084dbc9bbbdc---41976755143.pdfIn PDF document text
    • http://khyljg.com/uploadfiles/files/bunaxug.pdfIn PDF document text
    • http://creaorganization.com/depo/sayfaresim/file/10133641023.pdfIn PDF document text
    • 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_off0000e275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE275 9700 bytes
SHA-256: 6104ca59d4e509b3ac1f6629454b384e609e666eee4e20f0ac169dcf134e25d6
font_01_sfnt_off0000f7a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A5 17280 bytes
SHA-256: d76b1af6b74d4c74095a08b28b19f408fc3efbd3d13b97a0e19d6715d0097e58
font_02_sfnt_off00012439.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12439 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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