Malicious PDF — malware analysis report

Static analysis result for SHA-256 e37be905f8de2c90…

MALICIOUS

PDF

74.0 KB Created: 2021-09-24 18:02:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: d4eafece0ddee3fe1b54e8e39946c779 SHA-1: 00a6861848ac7a9247835b9550ca792d559184d3 SHA-256: e37be905f8de2c900b7a3a6249ab8b8099a8b894867cde207bf3e892f5c7e092
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The file contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting it functions as a link farm. The primary purpose appears to be directing users to potentially malicious external sites, likely for phishing or malware distribution, consistent with a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://crewmak.ru/uplcv?utm_term=poco+m2+pro+update+android+11 PDF link annotation
    • http://poexali.org/static/image/_u/system/files/53998450890.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/4cff25f8b41c3dc525201eb84c5dbab3/rezumiso.pdfIn PDF document text
    • http://wernersuarez.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mopubosuduvituzobude.pdfIn PDF document text
    • https://sma-dfgg.org/site/admin/file/76961062460.pdfIn PDF document text
    • https://www.totspotdaynursery.co.uk/ckfinder/userfiles/files/35241736834.pdfIn PDF document text
    • https://558com.vegner.com/userfiles/files/20210918_030118.pdfIn PDF document text
    • https://ecoverservice.be/gallery/file/famosovukonodukiridaxuv.pdfIn PDF document text
    • http://lasantitosrestaurant.com/userfiles/file/40109872119.pdfIn PDF document text
    • http://nicolalazzarotto.com/userfiles/files/60364711242.pdfIn PDF document text
    • http://aroma-es.red/yamituki-n/uploads/files/40817380220.pdfIn PDF document text
    • http://laiyi-art.com/userfiles/file/42521011857.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/sedafupowonilabo.pdfIn PDF document text
    • http://purepassion.pl/userfiles/file/73811592234.pdfIn PDF document text
    • http://turatabor.hu/media/919632211.pdfIn PDF document text
    • http://3wsystems.com/shipinc/userfiles/files/18239415135.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148f507a20f0---95576919814.pdfIn PDF document text
    • http://dayou.tw/uploadpic/files/202109240258125465.pdfIn PDF document text
    • https://rinducm1.com/contents/files/77840503949.pdfIn PDF document text
    • http://keemunblacktea.cn/uploads/file/171357493780.pdfIn PDF document text
    • http://sanfrancescovet.com/userfiles/files/fowunazipejomaxefivuwoxep.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16146a7d595226---sedirevubebinudaloja.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/161318f8154f72---87203471201.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/v15uld235p94aqgnidmk6agsls/paxudogifazivofuwo.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/74961086313.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_off0000b866.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB866 10732 bytes
SHA-256: a564ab4a3e6432f56fe784b6647902095e6bc8007d476234558d5fbdf8895f23
font_01_sfnt_off0000d120.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD120 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e932.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE932 18988 bytes
SHA-256: 17378a545764ea8f74a7b27e6e7b61c03725a358b4f84f122c64490de302eb92

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