Malicious PDF — malware analysis report

Static analysis result for SHA-256 b16bf934b509fdac…

MALICIOUS

PDF

84.3 KB Created: 2021-09-06 20:31:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3e95312ef50ab537138db5ef25736776 SHA-1: 2e3c4d92c0a3ead567a482787a10dfe9863b72d0 SHA-256: b16bf934b509fdacfa6ecc382076898206e8d76f27addf4e06a165d566ba0bd4
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that point to compromised CMS upload storage and disposable hosting, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612a597b3a9a9---21488198996.pdf In PDF document text
    • http://rc-modeller.se/images/file///84580995592.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/4hmefc6s5ajtaod9eap622rpa8/74281159888.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/qa1dk0hffdqapdgrtfd0t9e1d8/julana.pdfIn PDF document text
    • http://qazaqbanki.kz/data/content/files/similavomoxowi.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/62c34bb6caeb88b81267689ee59b823f/dusatajamopulevad.pdfIn PDF document text
    • http://megalaserasia.com/upload///balog.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a0c5a015e8---81990411104.pdfIn PDF document text
    • https://warungmimpishio.com/contents//files/31168501983.pdfIn PDF document text
    • http://ozona.pt/wysiwygfiles/file/xikenoximikepawokajov.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/4c5d50ce19132e5ff77635fd303708e0/febapejoziko.pdfIn PDF document text
    • https://tumsad.org/img/editor/image/file/58557141556.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/806vt7i9euftm6jvuf30rugudj/68567535996.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/nukotuvajawataketeja.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/tepajepazebavoriwig.pdfIn PDF document text
    • https://fonixkoncert.hu/upload/file/nosubofafopisu.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161133b14502f6---87727557340.pdfIn PDF document text
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/xonuzezarasasobokovawe.pdfIn PDF document text
    • http://sieuthibds.net/images/files/87370071128.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1609cfce43d75a---47894600537.pdfIn PDF document text
    • https://adikkedua.com/contents//files/50586307172.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/kenejusisurepifumiwix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=cards+against+humanity+pdf+espa%C3%B1olPDF 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_off0000dc06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC06 11396 bytes
SHA-256: 32831e0bdbb6de9fcc94e94c5748e3d93d08beae38546ed332a361a34748b2a1
font_01_sfnt_off0000f637.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF637 19892 bytes
SHA-256: 32e7941256fe608a6f60bf287b7dfff639f1a8da6b42081fd812a69185c49614
font_02_sfnt_off00012999.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12999 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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