Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd9b049d0acfdb8b…

MALICIOUS

PDF

75.6 KB Created: 2021-09-24 01:58:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 008342712cb244defa322eca7f462779 SHA-1: f8ed636f23ee8767925dce34aa33d4891076ae1c SHA-256: dd9b049d0acfdb8bb7d551104457c55edec5eae9351bcd50a40830bdfdb00980
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting domains. The primary purpose appears to be directing users to potentially harmful content, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://protetyka-lublin.com/images/wyswig_images/file/36338021184.pdf
    • http://dreambeauty.kr/upload/fckeditor/file/gofegoterinikisugat.pdf
    • http://ybshajiang.com/userfiles/file/2021-09-15/210915074200502688moghnie666y2.pdf
    • http://studiotecnicomancini.eu/userfiles/files/jifepibakizazeduwoliluxev.pdf
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/2d54d6dcf7818f01d7bd6b53168cd195/jasibexem.pdf
    • http://penzionnakrizankach.cz/ckfinder/userfiles/files/11520955394.pdf
    • https://calprin.com/ckfinder/userfiles/files/48226192877.pdf
    • https://dacinsara.ro/fckfiles/file/godalinivarimalape.pdf
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/86056175095.pdf
    • http://zanethompson.com/userfiles/file/bupines.pdf
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/bede78387b59cc89e3fff4c10500bb38/10385480136.pdf
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/f1e6a553a42cf6a38c23ead6947d80f6/lawusurodiliwigon.pdf
    • https://lexconsulting.ro/webroot/files/media/pomemub.pdf
    • http://maginsaatmetal.com/resimlerfiles/tigisodaxoxoxoxura.pdf
    • https://vishalahospitality.com/ckfinder/userfiles/files/22799120808.pdf
    • https://bulendengin.com/upload/ckfinder/files/90687139327.pdf
    • https://nezrenweb.com/calisma2/files/uploads/18591360346.pdf
    • http://potentialdesign.cn/userfiles/file/1631226244.pdf
    • http://mrcubezpieczenia.pl/app/webroot/media/files/tofufekapa.pdf
    • https://pagodatalk.com/_UploadFile/Images/file/76246477259.pdf
    • http://freestyler.cz/img/file/namagasixusurarad.pdf
    • http://actlogistic.vn/upload/editor/files/36180840437.pdf
    • http://ubytovani-budejovice.cz/picture/vtextu/file/kipezubulalozap.pdf
    • http://worldtile.net/jangheung/userfiles/file/23202353393.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=onead+play+games+apk
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c70d.bin
16d2a96dfde452c0d3a97bd2e8ee252fa03c78486dc8b3272accbce7b1bb56f0
pdf-font-stream PDF embedded font (sfnt) at offset 0xC70D 10556 bytes
font_01_sfnt_off0000def9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF9 16792 bytes
font_02_sfnt_off0000f70b.bin
2111f750629b551a49c64f86f42dc8bef33af3b793a564c861c682b5efd0d53c
pdf-font-stream PDF embedded font (sfnt) at offset 0xF70B 16472 bytes