Malicious PDF — malware analysis report

Static analysis result for SHA-256 617465cdbcb8fa76…

MALICIOUS

PDF

81.9 KB Created: 2021-09-18 08:08:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 82fc7452c6d091f720392ff37d65293d SHA-1: db93fa322db77e09002e447dbc6599442d17174b SHA-256: 617465cdbcb8fa764a6d6aaf1d6c52e41d8f96a050ac5b6f40e8c43aaaa8ad6c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised or disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious workflow designed to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • 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 https://irlanc.ru/uplcv?utm_term=how+to+change+video+background+in+kinemaster+app PDF link annotation
    • https://hzautomatisering.nl/userfiles/file/xizopubixijexerinivivuro.pdfIn PDF document text
    • https://lekkermooi.nl/userfiles/file/fefexasunobuvej.pdfIn PDF document text
    • https://ofly.om-digitalsolutions.cn/upload/files/31804264421.pdfIn PDF document text
    • http://boxshop.mn/userfiles/files/nofevegasilasa.pdfIn PDF document text
    • https://akgoz.zemta.com/uploads/files/jepesogazeno.pdfIn PDF document text
    • https://biocoils.com/img/file/gidepirixukekusipe.pdfIn PDF document text
    • http://openendrep.com/userfiles/files/sugosuxof.pdfIn PDF document text
    • http://4rrecycle.com/files/file/rekedunuxuduzumiboral.pdfIn PDF document text
    • http://olympusflights.com/files/files/kidijazomusoposisetot.pdfIn PDF document text
    • http://gtlmarinefuel.com/userfiles/file/vivobolilepe.pdfIn PDF document text
    • http://smartickgroup.com/userfiles/54423339981.pdfIn PDF document text
    • http://monterroso-construpuntos.com/campannas/file/deguzupibobulima.pdfIn PDF document text
    • http://veitali.com/upload/files/17041729958.pdfIn PDF document text
    • http://dpsnowodworze.pl/userfiles/file/57680282005.pdfIn PDF document text
    • http://cbcom.fr/ressource/site-image/files/nojalaxokiwemamope.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613a42238b4fb---bagufi.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140d78e3b791---godoforupop.pdfIn PDF document text
    • http://npi-management.com/ressource/site-image/files/tidubir.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/83412238357.pdfIn PDF document text
    • https://ptogel2.com/contents/files/83909515186.pdfIn PDF document text
    • https://greenlandpark.com/uploads/files/80050717051.pdfIn PDF document text
    • http://orthodoxnews.us/file/78323117997.pdfIn PDF document text
    • http://bensonlandscape.com/editorData/file/73709336846.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/5a3f462d33e352fc5387dc9c5068ee4b/birowuvupufazagilerefigid.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/42949945342.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_off0000da4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA4A 11392 bytes
SHA-256: bca7b29a5dfdfc64237e3d92d52a25d715463c864d8307d3b447541c4b09ce1e
font_01_sfnt_off0000f496.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF496 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ca8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA8 17624 bytes
SHA-256: f15929496f3605c5db16eb1ce2747e361f10e9b056c5d859ba075a697e245f45

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