Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fb560dd3728edd2…

MALICIOUS

PDF

74.3 KB Created: 2021-09-08 00:34:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d433cd204e8ba99a6eb7dce57fc1ba2e SHA-1: de3c85c46f882be3a045d978383740f48d5ec427 SHA-256: 1fb560dd3728edd22b1e8bd94ed055e1481f8061e74a2ffae6cc0d9e4ec2214e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ClamAV and a machine learning classifier. It contains numerous URLs pointing to potentially compromised websites or link farms, suggesting a phishing or malware distribution attempt. The PDF structure includes link farms on disposable hosting, further indicating malicious intent. No scripts were extracted, but the presence of external URIs and the overall heuristic profile strongly suggest the document is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://archism.ru/uplcv?utm_term=applications+of+lyophilization+pdf PDF link annotation
    • http://geriatriccarenewjersey.com/userfiles/files/wiputirabojagizegipinab.pdfIn PDF document text
    • https://conexkarvan.com/cache/fck_files/file/dakurufegalanubibewinex.pdfIn PDF document text
    • http://saluteebenesseresas.it/userfiles/files/zoratodolido.pdfIn PDF document text
    • http://geodez.com/pliki/file/wujodituperimonefitim.pdfIn PDF document text
    • http://bosch-service-center.ru/uploads/files/momagasarenigosokuwezer.pdfIn PDF document text
    • http://chapelguild.com/images/usr/foxabesudiwamawadibus.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb8f9a1f331---muxemij.pdfIn PDF document text
    • https://finatwork.com/userfiles/file/mijujosofamuberowirukut.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/lizedoxewusomonapujipanik.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/9dfe090f1159e4b1dec138a10b9553bb/20085931340.pdfIn PDF document text
    • http://bolt.fo/public_html/userfiles/files/62705864827.pdfIn PDF document text
    • https://www.highettmetal.com.au/application/third_party/ckfinder/userfiles/files/wugirawupavifulurikejisen.pdfIn PDF document text
    • http://roweryelectra.eu/app/webroot/uploads/file/16215160789936.pdfIn PDF document text
    • http://ruresept.ru/files/file/wirezogapuj.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae37dcb07ac---favivazefomib.pdfIn PDF document text
    • http://mldinsaat.com/image/files/netugafezelefolafisa.pdfIn PDF document text
    • https://777mto.com/contents/files/sipuwoxidot.pdfIn PDF document text
    • http://immobilieninvestors.de/userfiles/file/55580160584.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612383b0c6ade---28827381466.pdfIn PDF document text
    • https://www.wappa.com.au/siteadmin/ckfinder/userfiles/files/39399760011.pdfIn PDF document text
    • http://gryfarmerskie.pl/pliki_wyswig/files/24441150438.pdfIn PDF document text
    • http://seasonsblinds.com/uploads/ckfinder/userfiles/files/3007714677.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b53b3381af4---83638347546.pdfIn PDF document text
    • http://peusch.lu/userfiles/files/xewuma.pdfIn PDF document text
    • https://cargotavio.ru/files/file/noxudebidajiwedud.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088de886b1b9---narowiwidedunumov.pdfIn PDF document text
    • http://cutskytools.com/d/files/bulenin.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_off0000bbfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBFE 18404 bytes
SHA-256: 37e354d4532bd224500ca5a756b73a5378862dc58d78d42355a31bf01f2ccdf8
font_01_sfnt_off0000eae7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE7 10640 bytes
SHA-256: fd0235ecd0ec5915c649d4dc1e4955428cf480412876e08063dea460b1b7eea3
font_02_sfnt_off0001034a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1034A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1