Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3759a1164fb1c53…

MALICIOUS

PDF

78.8 KB Created: 2021-09-17 14:57:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b521cbe0844627b9f45bfcbe966ef5c4 SHA-1: 0be3c220eb44c3be4df49d202d7a2a440cf8cd0d SHA-256: d3759a1164fb1c53c80e7a91311837bc894987f03c46083919c6c76729510e48
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to domains flagged as link farms or potentially compromised CMS uploads, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the structure and URL patterns are consistent with a phishing lure designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://szigmetal.hu/editor_up/86044862716.pdf In PDF document text
    • https://produktybhp.pl/pliki_user/File/66345599178.pdfIn PDF document text
    • http://farmaciafoglia.eu/userfiles/files/36511614375.pdfIn PDF document text
    • http://foodzipo.com/uploads/userfiles/files/19910986434.pdfIn PDF document text
    • https://lexconsulting.ro/webroot/files/media/tijozulijete.pdfIn PDF document text
    • https://alzubidi.com/userfiles/files/depijulaf.pdfIn PDF document text
    • https://jpjplumbingandheating.com/FCKeditor/file/xuvalox.pdfIn PDF document text
    • https://pmapmc.com/userfiles/image/files/fuxuler.pdfIn PDF document text
    • http://fueandhair.com/userfiles/files/rikaziv.pdfIn PDF document text
    • http://trongtinpc.com/luutru/files/bakupubalipeviwidufatizi.pdfIn PDF document text
    • http://turnwealthy.com/ckfinder/userfiles/files/3712307492.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/tebatetuzupelomamopa.pdfIn PDF document text
    • http://philipp-haberland.de/images/upload/file/fejesipidagokojepuse.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/43b202a515f07ce106c28d0533e2c715/30933029645.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/43abfea9df16cc49ed69bb21b5751fc9/gisikiwagek.pdfIn PDF document text
    • http://farmandari-sarvestan.ir/images/news/files/14262624629.pdfIn PDF document text
    • http://chekeeh.ir/basefile/chekeehir/files/nodasexov.pdfIn PDF document text
    • http://inkjetartandimage.com/Uploads/file/98625133408.pdfIn PDF document text
    • http://smelawservice.com/file_media/file_image/file/85081636374.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161383391de020---retupujogizetusametuja.pdfIn PDF document text
    • http://dungcubepgiangtrinh.com/webroot/img/files/maganigonamolinukodoxoruz.pdfIn PDF document text
    • http://odontoflash.eu/userfiles/files/gobanonima.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=necrophonic+app+mod+apkPDF link annotation
    • http://perfecturology.cafe24.com/upload/editor/imagefile/72163955200.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_off0000cefd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEFD 17932 bytes
SHA-256: 67734f0e6ce98f883306569572a1dbe836dea0e0fa049580277e5b635c359609
font_01_sfnt_off0000fde4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE4 10536 bytes
SHA-256: 4445104fbc47050f7a27126c70322571eac812d196220ec1c23ae9554eb5b1a9
font_02_sfnt_off000115a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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