Malicious PDF — malware analysis report

Static analysis result for SHA-256 2dd5e7ac0537d0f3…

MALICIOUS

PDF

86.3 KB Created: 2021-07-24 06:49:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 19149d899f08925c0ed66bc09afdf57b SHA-1: 3ca0409b448e58d2a47ad966eadab6fd79ce9c82 SHA-256: 2dd5e7ac0537d0f3aba1a3ee61b056411e29727dce80dea02b577b82dc52aee1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The PDF structure and embedded links suggest an attempt to redirect users to potentially malicious content or phishing sites, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://lensprovn.com/ckfinder/userfiles/files/77367541311.pdf In PDF document text
    • https://niboparis.com/upload/fckeditor/files/duluwojom.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16080ad48e749a---25649595334.pdfIn PDF document text
    • https://centrumschoolka.pl/photos/file/ragilivukabinexozoxitu.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/286aa7c6996d337d2605dee26d93c16c/79363618514.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/16271719697.pdfIn PDF document text
    • http://prtourusa.com/FileData/ckfinder/files/20210626_0DF7B7D606B52200.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f13540c706---95175629265.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/kijiwogavo.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/1d626a4f9f2044235a1af88f0f1f0411/selepusivaluragog.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/fbb3b42d8617f3994d978ce612e8ee75/84307580318.pdfIn PDF document text
    • https://stegopackaging.com/wp-content/plugins/super-forms/uploads/php/files/inqv8lac9a94cbn486vkhpace0/mawajanomi.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/i8j1teqlv79dh6pt3q81kj0ej0/zosupu.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607125fbe4567---gonupara.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/2a3a8b7703e72fb3d9223ae0fec54287/40855305289.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed4fc52d43---91004111275.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/nc5o0m15e0vedaaqfpo1ug6hu5/bedakatelavedopuzot.pdfIn PDF document text
    • https://bluza-shop.ru/content/File/risorifefisu.pdfIn PDF document text
    • http://kangs78.com/clients/66216/File/95454547222.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/12911454765.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/068b7ff176632a00fd63e018d5c738fa/951130521.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/joziteturijane.pdfIn PDF document text
    • http://thaide.org/userfiles/file/xozukewesoribekijipepaz.pdfIn PDF document text
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/68371661305.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+say+peux+in+frenchPDF 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_off0000ead0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E7 10924 bytes
SHA-256: 2134cbe4c71104e5c9c5503d1e49dc3ed58c7171481d0c2b56ea9982203ac86e
font_02_sfnt_off00011c3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C3E 18424 bytes
SHA-256: 6b62aa5609970fe97c952fcc7ee9194d7c8e0fd383ea89cf306ad9c7cb7c50df

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