Malicious PDF — malware analysis report

Static analysis result for SHA-256 89e16ad788664975…

MALICIOUS

PDF

79.3 KB Created: 2021-09-12 19:05:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2f90ca34b3b0af1f28654a66ddda62a2 SHA-1: c070937a42d62fcef5f1b78c846da7cfe11f7e5e SHA-256: 89e16ad788664975760fbca879d0ac7cf577e5d10a05b4e1e5b864236b4ca1e6
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb4becb388---72537824429.pdf In PDF document text
    • http://penzionnakrizankach.cz/ckfinder/userfiles/files/53821258579.pdfIn PDF document text
    • http://rosesrealtyhomes.com/userfiles/files/radir.pdfIn PDF document text
    • https://butchercurnow.com/img/shop/contents/51328980872.pdfIn PDF document text
    • http://nobody-films.com/bpms/includes/fckeditor_uploads/userfiles/file/28371725043.pdfIn PDF document text
    • http://rainhouse.kr/data/editor/file/1554842472613d2a30665ff.pdfIn PDF document text
    • https://greenline.bg/userfiles/file/sezura.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/fizokabujowetixokuxuji.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f9db49be04---35405583989.pdfIn PDF document text
    • https://twinscooking.nl/twins/userfiles/file/nejineno.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/favadavudavijivavarufanun.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/2skmo8jc0rl4scjinktqht6e96/loperalazadire.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16131b6a54cacf---27428534982.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/getedesagafisujap.pdfIn PDF document text
    • https://ajansnigde.com/resimler/files/47378435629.pdfIn PDF document text
    • http://yangpupark.com/uploadfile/files/pazavunukeni.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/dafudununatiroxom.pdfIn PDF document text
    • https://prosaison.fr/userfiles/files/pedusifodadegon.pdfIn PDF document text
    • https://stradatextiles.com/upload/ckfinder/files/mikegumoj.pdfIn PDF document text
    • https://ijaetis.org/ckfinder/userfiles/files/58888415552.pdfIn PDF document text
    • https://stradatextiles.com/upload/ckfinder/files/77357685320.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=sat+practice+3+answersPDF 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_off0000d445.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD445 10536 bytes
SHA-256: 7234aab01812916413b35b097da2dd799c6341415545a29a9d7294791188f3a4
font_01_sfnt_off0000ec75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10487 16788 bytes
SHA-256: 043d487e28299504f2f012497ea4f871bb27bd9422060d0da66f6c4736e8edff