Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0db11980aeb4bfd…

MALICIOUS

PDF

82.1 KB Created: 2021-09-12 07:45:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 10ed744113de36dead1fdcb51e8f256f SHA-1: b5869ec31ee94aae496b97440a86e15dbc0f65ce SHA-256: f0db11980aeb4bfdd5d7c014161bb6332c717c92b886154d5683910051982065
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm, with many URLs pointing to potentially compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of numerous unknown and potentially malicious URLs supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dishandspoonproductions.com/ckfinder/userfiles/files/67094293485.pdf
    • http://encino.ilovepokebar.com/uploads/files/87490576315.pdf
    • http://diplomat2014.ru/ckfinder/userfiles/files/91139145703.pdf
    • https://www.karelo.com/uploads/File/68421104957.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613933a0cc83b---tidogelupotudux.pdf
    • https://awinresource.com/uploadfile/file/jubuwifininetozuvibemat.pdf
    • http://bischofs-scheune.de/userfiles/file/45443600518.pdf
    • http://www.gamylai.vn/uploads/files/45651843848.pdf
    • http://onishi-kyosendo.jp/archive/66427843784.pdf
    • http://www.trackls.com/application/ckeditor/ckfinder/userfiles/files/kibog.pdf
    • http://liveranigioielli.it/userfiles/files/zatedira.pdf
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/de3u9585uajj1cb04qhhp4r68d/wamof.pdf
    • https://aneri12.cz/res/file/93874795733.pdf
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/dmt876pi0rda3h21erf1gei79i/80596893661.pdf
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16135f783dd700---mujubesal.pdf
    • https://trongtrucsolution.com/uploads/files/62737035253.pdf
    • http://sbkf.org/files/files/pixowuvujatinebopeso.pdf
    • http://sunwisechem.com/Uploadfiles/files/juxezipifituwitizodibo.pdf
    • https://dom4m.by/userfiles/files/dumawurokojavezajawof.pdf
    • https://futurefacesnyc.com/uploads/file/29935374109.pdf
    • https://dehayemek.net/upload/ckfinder/files/siretuxiwomiviloza.pdf
    • http://mail.teleserviciomalaga.com/ckfinder/userfiles/files/gariwulidogemelegidipesu.pdf
    • http://montpellier-businessplan.eu/mbp/upload/images/images/upload/ckfinder/vuzugetavakiwosumerofuzov.pdf
    • http://balassalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bavetidepukaxobejaputul.pdf
    • https://semut73.com/contents/files/nezekusanekuvanezufowozi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=importar+contatos+iphone+para+android
    • 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_off0000db4f.bin
3285c57efb84a081f814706aaaf9de09ecb52edde2d3141c5928754ad6ab9932
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB4F 10684 bytes
font_01_sfnt_off0000f396.bin
a1f07b5e81ed8d7203a3c87e8798b6398006966897e7eead3cd7ecc4c337a133
pdf-font-stream PDF embedded font (sfnt) at offset 0xF396 19260 bytes
font_02_sfnt_off000122a2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x122A2 16792 bytes