Malicious PDF — malware analysis report

Static analysis result for SHA-256 675d4b797dd6d91b…

MALICIOUS

PDF

95.8 KB Created: 2021-09-21 20:08:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f2b8e754c6613654f057d035ee04191c SHA-1: abcf0e2dd832b9691e01430148f193b33b9a50ac SHA-256: 675d4b797dd6d91b1b94256d1914cf453e0b08529b942c2dd76f7200e1dd30e5
156 Risk Score

Malware Insights

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

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 through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

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://pixomot.ru/uplcv?utm_term=do+i+need+to+play+dark+souls+1+and+2+before+3 PDF link annotation
    • https://belitour.ir/basefile/belitourir/files/gakirafiniwovuv.pdfIn PDF document text
    • http://enjoy.sk/editor_uploads/system/files/93004991883.pdfIn PDF document text
    • https://davnosti.ru/upload/97469174198.pdfIn PDF document text
    • http://www.cerel.eu/images/wyswig_images/file/gaveg.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/161399c86b434c---mutakuxalapozetefawo.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/25293607442.pdfIn PDF document text
    • http://mindennapi.hu/upload/file/nixuduvobopabejesa.pdfIn PDF document text
    • http://stroyindustry.com/userfiles/file/lededejikilamepuzituwa.pdfIn PDF document text
    • https://www.wizzfizz.com.au/application/third_party/ckfinder/userfiles/files/vufodilav.pdfIn PDF document text
    • http://nscenter.cn/upload/files/fovotajivuvexozufeba.pdfIn PDF document text
    • http://systemsbiology.at/uploads/assets/file/bilumamijox.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/mazipoparan.pdfIn PDF document text
    • http://g-shocktou.com/user_file/file/pejes.pdfIn PDF document text
    • https://franchise-vietnam.com/app/webroot/img/files/zexamapipilefatitu.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/c0345b47dc2ea11da41c3f162530d956/xapad.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614308eff16f1---80461644500.pdfIn PDF document text
    • http://eia-edu.com/userfiles/file/xurideken.pdfIn PDF document text
    • https://aldaserwis.pl/ckfinder/userfiles/files/lamepogapikenomigopop.pdfIn PDF document text
    • http://supair-lux.hu/ckfinder/userfiles/files/boravukakuwosaza.pdfIn PDF document text
    • http://wasserburg.pl/userfiles/file/667473675.pdfIn PDF document text
    • http://twozonechickenlasvegas.com/uploads/files/xuzebeweb.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/98662616821.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/61339669983.pdfIn PDF document text
    • http://s292376414.onlinehome.fr/datas/imgmail/file/11711078737.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000104da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011cec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CEC 18236 bytes
SHA-256: 688198b2f911667f6e7e28e7bb907e8ffa5e1cabe7c4d486334d629cfed2e2d4
font_02_sfnt_off00014c63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C63 2192 bytes
SHA-256: e64fcd345705f7b09383ea89d03cad7d7aa2fccf1ec4e02aafc081ae9bb5575c
font_03_sfnt_off0001563d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1563D 11284 bytes
SHA-256: 04d3edd4715ddd9b0b20a18abdd534739bc0f4c8144c890372e42d35165d947c

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