Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3c19cf65f953599…

MALICIOUS

PDF

80.5 KB Created: 2021-09-05 09:51:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 93c94f298a6234bb70dbc70130ef9da2 SHA-1: 53af9b35935b4ca6f82e9f44be066bb3d7945d0e SHA-256: f3c19cf65f9535994269bb7a8d123675356f23bf94f42f299d62e02476aa56df
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised websites, indicating a link farm designed to redirect users. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' confirm this behavior. 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 0.9975

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 https://ketchas.ru/uplcv?utm_term=photoelectric+sensor+pdf PDF link annotation
    • http://thedewakohchang.com/image/upload/File/oloxibimikor.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160960bae714eb---8370587101.pdfIn PDF document text
    • http://travelport.pl/userfiles//file/40464932542.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/52815816073.pdfIn PDF document text
    • http://kleinschadenexperte.de/userfiles/file/97756635535.pdfIn PDF document text
    • https://penal-garazh.ru/files/63003497226.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/hnjemlidgrmkebg0n2b1gp4n63/vubetikozijiduge.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1609c3570ed048---dananotab.pdfIn PDF document text
    • http://msiutilities.biz/documents/mikeb.pdfIn PDF document text
    • http://erex.hu/upload/file/wadimabeselogafuzokugan.pdfIn PDF document text
    • http://defaico.com/d/files/pijonufumato.pdfIn PDF document text
    • http://unnatiwelfareorganization.com/ckfinder/userfiles/files/donaw.pdfIn PDF document text
    • http://gloucesterclassof81.com/clients/23558/File/nemazujakemumozasewuguman.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a42dea67d90---34496196820.pdfIn PDF document text
    • http://izumrud38.com/ckfinder/userfiles/files/29237693751.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/34142811345.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/79952617238.pdfIn PDF document text
    • https://path.mn/userfiles/files/sazidu.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/navakovowapapedomofogabid.pdfIn PDF document text
    • http://milwaukee.center/userfiles/file/41818803013.pdfIn PDF document text
    • http://secretlove.ch/ckfinder/userfiles/files/97046928382.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e5566be2b---timidim.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/27451439465.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/51982951015.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/3092143834.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d635.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD635 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE47 17808 bytes
SHA-256: f863ccc3c3c1b34739ca0eb1ca918e20f6f1726da648ececa6b8f73b10101bd5
font_02_sfnt_off00011c1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C1F 10556 bytes
SHA-256: 9e9f7e8b4ad4708ea7a68f98bd45f9382909ad3f38ab636be30fb11abd14f471