Malicious PDF — malware analysis report

Static analysis result for SHA-256 eca98d3ea406c9f2…

MALICIOUS

PDF

78.2 KB Created: 2021-09-02 16:36:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d643472ba6506082a83c3f65b5d798e0 SHA-1: 492aeea83b3ac044e971ce83c6eca130102994f6 SHA-256: eca98d3ea406c9f276b5cca3c96b09c0decc3851d415a935ec2e101487defd59
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to compromised or disposable domains, likely intended to trick users into downloading further malware under the guise of a PDF compressor. The document body is heavily obfuscated and unreadable, providing no direct textual clues to its purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://mygotour.com/FileData/ckfinder/files/20210630_E325A82108699D2A.pdf In PDF document text
    • http://www.aluvascientific.com/UserFiles/file/42334510186.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/ae61391b7f6a9024309b1893e4df2d3e/xujizivu.pdfIn PDF document text
    • https://triptoboloyfoundation.org/editorsfiles/files/tirisit.pdfIn PDF document text
    • http://makingtheturngolf.com/clients/9/92/925d9bae4ecf380f28dbe0e1390c16eb/File/mojinebu.pdfIn PDF document text
    • http://0965818789.com/CKEdit/upload/files/nozefakepig.pdfIn PDF document text
    • http://scherzerpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/64219846074.pdfIn PDF document text
    • https://www.indoorclub-informa.com/boletines/img/file/78658778830.pdfIn PDF document text
    • http://sireny.net/share/files/84902661467.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/fuworazel.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16075cd78504f4---niruzefa.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/20218518008964.pdfIn PDF document text
    • http://articolo17.it/siti//usr/foto/files/ragubora.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/146f8b939f43851e245352d66473452b/kikipufezexosakogisupo.pdfIn PDF document text
    • http://gmei.lt/ckfinder/userfiles/files/17976147361.pdfIn PDF document text
    • http://nakamurasangyou.jp/app/webroot/uploads/files/55047827351.pdfIn PDF document text
    • https://serrechevalier-skifun.com/imagesfile/piwusejo.pdfIn PDF document text
    • http://hoaisonland.vn/upload/files/rajafojorarawa.pdfIn PDF document text
    • http://thietbikhachsanvinhhung1.com/upload/files/60520695911.pdfIn PDF document text
    • http://ediljolli.com/userfiles/files/34736506640.pdfIn PDF document text
    • http://phanvienphianam.com/uploads/userfiles/file/xewezubunino.pdfIn PDF document text
    • http://toddfamilyreunion.com/clients/4/48/482e924d5a052aa4a0c13eb8a30e0bc8/File/63616324316.pdfIn PDF document text
    • http://vngo-cc.vn/cooker/public/files/benitafaxoneketuro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=pdf+file+compressor+downloadPDF 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_off0000cf91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF91 16288 bytes
SHA-256: 40e466c9d9f358302111ff819b551a7752420f497c1812f5a5af3dbe2023e0e4
font_01_sfnt_off0000f9e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E2 10768 bytes
SHA-256: f6b45a335ec3e53abe9b2089c5609fcd0d4efeec44469054449186546e73ae4b
font_02_sfnt_off000112a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.