Malicious PDF — malware analysis report

Static analysis result for SHA-256 be275b77c4d6d55f…

MALICIOUS

PDF

81.5 KB Created: 2021-09-08 05:25:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d980a97ab4ee127276ae53abd4075dea SHA-1: ccef809676e4bc634af7618d0aa49f880da6d0f1 SHA-256: be275b77c4d6d55fbb234d7cdc18e82cd917baca6d297b95c97b40537cd6b806
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to external resources, some of which are hosted on compromised CMS upload directories or disposable domains. This suggests the document is designed to lure users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://accessiblevehicleservices.com/userfiles/file/43770966874.pdf In PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160afc5fc6c496---kemirinakefewusefudiv.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/f3cfa94a717f15705ebf8b421a832c83/zafinupadokepumixef.pdfIn PDF document text
    • http://prosquash.by/data/19730326215.pdfIn PDF document text
    • https://stayinbranson.com/ckfinder/triplebuserfiles/file/36501967720.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/16078f7f15bc08---xefifoxewowuvezig.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/4396a3b3c160aaeca22d39a6a717e646/bitolusiziwetirigaxoxek.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7378ec6c21---jufibiragewe.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/1cf23bf470da77ebb8ca04d7ef9c1225/72249406280.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5699eb35e---93636437627.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/10b9f38b943d36154140c145e58e1d2b/fufatu.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/d100b077214e470ebfeaf95ddcb83b27/bavunirop.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/19551272932.pdfIn PDF document text
    • http://tverzhilservis.ru/foktver.ru/ckfinder/userfiles/files/38434326849.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16086f8ffb6353---vuwewigivegi.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/68343608188.pdfIn PDF document text
    • http://gruaszarate.com/ckfinder/userfiles/files/9565210157.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/31855568053.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/c4d39a47226b271a796fae7bb50d6a6a/69109856802.pdfIn PDF document text
    • https://www.nuyew.academy/wp-content/plugins/super-forms/uploads/php/files/65501600bbf5bf68f90afd23cae6f2e5/47523837526.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16102c78b66698---juginuvafoxigogowiguge.pdfIn PDF document text
    • https://khabul.mn/mmpa/userfiles/files/jokufibapizikubuja.pdfIn PDF document text
    • https://businesslife.com/content/file/taluxijofuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=interjection+notes+pdfPDF 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_off0000d8d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D2 10484 bytes
SHA-256: 65c6ae343633268caf94f00b0d269c91585a6be4e49c8975aa341b09d947cc99
font_01_sfnt_off0000f0bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BC 18544 bytes
SHA-256: f0a59e7258f1d6605454639295dd5fa0747676ab8c067874c6574af4cabe3bc5
font_02_sfnt_off00012074.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12074 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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