Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f1b915aa916f7af…

MALICIOUS

PDF

75.7 KB Created: 2021-09-12 09:10:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f83f49ac89f1efb831be4a8fd5fad26d SHA-1: 15a78d01962f312c2e049f7f4ce7060413acf089 SHA-256: 2f1b915aa916f7afecada772ac23f2e39de281722f76d050845dca8358d6423b
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://travelport.pl/userfiles/file/gidebivimukupawo.pdf In PDF document text
    • http://e-sportis.com/images/upload/88284848184.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc1cb4141f---kolojepagivofume.pdfIn PDF document text
    • http://sicilyontable.it/userfiles/files/74488233704.pdfIn PDF document text
    • http://phukhoabacninh.com/images/files/93402712288.pdfIn PDF document text
    • http://jungvassar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/21767394998.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613041afb723e---73524445802.pdfIn PDF document text
    • http://tipsclubcr.com/campannas/file/gasesabozavug.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/8712560497.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/60257379405.pdfIn PDF document text
    • https://myphambambi.com/webroot/img/files/mateluvupadovaremalajuke.pdfIn PDF document text
    • http://greenglobepms.com/uploads/tewogupu.pdfIn PDF document text
    • https://kfk-dekoration.dk/images/uploadedimages/file/volaxunoseb.pdfIn PDF document text
    • http://brilliantsolarpaneling.com/userfiles/file/dimarususajigeribi.pdfIn PDF document text
    • http://immobiliareborghi.com/userfiles/files/loxubixuzubediwa.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/f06cecf45e3ef973de564699b1d3c0e7/84301090333.pdfIn PDF document text
    • https://bocrangsuthammy.vn/upload/files/lamovur.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/baxofofivusalotubuv.pdfIn PDF document text
    • https://thietkewebseo.com/webroot/img/files/95895628456.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/moepmqeo7iba63nhj1o9lbihi5/mezumerosawakadufuvupip.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/movuzaponepiw.pdfIn PDF document text
    • http://www.cavice.fi/tiedostot/files/remevukawub.pdfIn PDF document text
    • https://pensiuneaselina.ro/userfiles/file/74444198083.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/joxuverasugomaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=demon+slayer+the+movie+eng+subPDF 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_off0000bde4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDE4 10976 bytes
SHA-256: 9d54924eac1176cedd7b59bc99fd00367d09ec3fa94f440d9ff35a89a05240a1
font_01_sfnt_off0000d735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD735 19252 bytes
SHA-256: d50bbef562f76027aae5b94753bb8b02f41b009f96005acb7a11b99a05e85089
font_02_sfnt_off00010996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10996 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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