Malicious PDF — malware analysis report

Static analysis result for SHA-256 286fe24a2dc738e5…

MALICIOUS

PDF

85.9 KB Created: 2021-09-07 17:49:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6cade8f4963b1c01b5593339371db202 SHA-1: 6495fd259e2055a6502fb8a014990830b2d8cc1e SHA-256: 286fe24a2dc738e5eecae74097b7d86d6782443c87bbc8a453558b125f8254b8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, as does the ML_NYX_PDF_MALICIOUS and CLAMAV_DETECTION firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://chuyennhakienvangvn.net/upload/files/59440485634.pdf In PDF document text
    • http://nickelsgrafikdesign.de/ckfinder/userfiles/files/gobujivizigewos.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/7f3e4egfld6m6u1hhm1trbhrl8/jekaxeredafidilagav.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/93943186724.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/32983534110.pdfIn PDF document text
    • https://pcparts.fr/ckfinder/userfiles/files/narobupomejomasululidik.pdfIn PDF document text
    • https://on-call-anatomist.org/ckfinder/userfiles/files/16941395280.pdfIn PDF document text
    • https://www.totalblissbeauty.com.au/application/third_party/ckfinder/userfiles/files/55753644574.pdfIn PDF document text
    • http://sushinamu.com/uploads/files/54358875829.pdfIn PDF document text
    • http://interreg-ipa-husrb.com/downloads/81225250870.pdfIn PDF document text
    • http://hondasushi.com/uploads/files/63796789229.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/a2174e1a157a721ce4a80aa1fffee981/galiwiwojumi.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021072521455573499.pdfIn PDF document text
    • http://delve-cr.com/uploads/23279641175.pdfIn PDF document text
    • http://etkindenetim.com/resimler/files/88966523791.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/844rjthh80urqavikav8bc2v6b/namewajuzematuwuxuk.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1ae073866---noraridopaditasomaba.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bb34d477d58---wadasimililavigunuji.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608572bc19649---xirezejibotuwato.pdfIn PDF document text
    • http://lueckerreunion2020.com/clients/e/eb/eba09433058400eda594a485f9004317/File/vewosimusulatipawi.pdfIn PDF document text
    • http://michellenevinracing.com/FCKeditor/file/tuxagiropubeborupukewe.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad913188829---60132918600.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/sisopep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=soft+skills+pdf+booksPDF 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_off0000ecbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D1 17784 bytes
SHA-256: d29834c4e4e735c056e6e7421e40e195d4b0785127f0340dac221e5e3ce17ce0
font_02_sfnt_off000132ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132ED 10300 bytes
SHA-256: 0a3d03e3310f592722efe6bcb55aae247c1d3e1abd582806fa71de1a99421753

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