Malicious PDF — malware analysis report

Static analysis result for SHA-256 30a839db6b6df783…

MALICIOUS

PDF

81.3 KB Created: 2021-07-02 00:36:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 09bd4e77af9d4e71718731ed35a9c71f SHA-1: 4b06301ac157bb7e5d1b6111810d3cf8c97e8acf SHA-256: 30a839db6b6df7836328367cbe14ce4bf56dbf3a78abbcbe3e2c600d26e12878
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links to external PDFs, some hosted on compromised CMS platforms, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' lure further supports a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://archism.ru/uplcv?utm_term=fortnite+apk+android+no+human+verification PDF link annotation
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/ibpl06g1odoceebc5rvrh8fnmg/xulemobejesezas.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/98b078e1798692816f3356a15df7bc43/kijivixilisugifo.pdfIn PDF document text
    • https://abeess.com/userfiles/file/81810579081.pdfIn PDF document text
    • http://nomaquito-travel.com/editor-images/5146917246.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adcbd8daef1---10299582018.pdfIn PDF document text
    • http://dfwarbitrator.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/89165918503.pdfIn PDF document text
    • http://yilip.net/userData/board/file/22368547818.pdfIn PDF document text
    • https://33mobility.net/uploads/files/relowotod.pdfIn PDF document text
    • https://mytopics.it/uploads/file/kavuwekufum.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/3228928684.pdfIn PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/31038236945.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/d444f565ff48bad719e25d430cf88baa/93059327420.pdfIn PDF document text
    • https://mangmalungtea.com/userfiles/file/34323721141.pdfIn PDF document text
    • http://imailbox.nl/images/uploadedimages/file/vaxifitaxel.pdfIn PDF document text
    • http://www.biotanika.pl/upload/file/giwowi.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/uv9ncnvhqmmitjps8btl6vsse0/76996650740.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/37575634354.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/87cc0ad924443e9d0e11784e833d228d/63473014044.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608360d90e714---44026657150.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090a7be3d6d0---feviximexiv.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160700358bdf8a---latovogerimafa.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_off0000d7a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A8 10904 bytes
SHA-256: c952efd54e4a8ee1874b3a2e2d1eccb2465862dea58e5e65311e16d67efacada
font_01_sfnt_off0000f0b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B1 17368 bytes
SHA-256: b82142c94acc0da4ca60743ed7279a96c528319be90b4ec874e4c83761fae2ee
font_02_sfnt_off00011e10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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