Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2b2ad2f1e1dc32c…

MALICIOUS

PDF

83.4 KB Created: 2021-09-06 10:44:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: ddba9a19b2c8657a07416724f24a6d37 SHA-1: 043cf53ba7aea134b830ed4309dd91ea8e5171c0 SHA-256: d2b2ad2f1e1dc32c176c99bf6e3648e064ed643d8c308b01325bba928cc2f4c4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is a PDF containing numerous links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of a link farm on potentially compromised infrastructure suggests the document is designed to lure users to external malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e6b880de6d---18941861841.pdf In PDF document text
    • https://nisahanpin.com/calisma2/files/uploads/fugisobubisodigatunawasop.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/rewabevipevopopojo.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b76fa635afa---tegubofeg.pdfIn PDF document text
    • https://infiniteprospects.com/FCKeditor/file/67688459575.pdfIn PDF document text
    • https://altaitur.com/ckfinder/userfiles/files/pepajexanorilabijixima.pdfIn PDF document text
    • http://mondoacquapiscine.com/userfiles/files/mipanokagojerijase.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/ec869c7d4e36c01e1c4b5762a2b8421e/80812551994.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/93726129551.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/f176f64429ae0976b0290b52d199ce64/wepubawotuwakivopubin.pdfIn PDF document text
    • https://nhakhoaanphuoc.vn/uploads/files/lenusasuguredurabevigito.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089aa38ceb26---baxoxuvu.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16108638f47ecb---bowobisoj.pdfIn PDF document text
    • https://xuantruongtech.com/images/ckeditor/files/rexepegabitoj.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/64240689270.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/26440781417.pdfIn PDF document text
    • https://lemanssrl.it/file/12679637141.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1610b0785aa318---sadoba.pdfIn PDF document text
    • https://ssmahavidyalaya.org/lion/uploadedfiles/fck/files/file/5862829985.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/r40065retgi2re5cjemc4tdvic/68925782096.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/7b96246f9382738e4174085bf8609b89/koguputofoka.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/dovudabusolez.pdfIn PDF document text
    • http://harnettcountyhba.com/userfiles/file/zafufixikebubinune.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=railway+group+d+practice+set+pdf+2018PDF 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_off0000dc60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f472.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF472 18668 bytes
SHA-256: 91d0c4184821858887d33e628d962012253816c2f5ec8b0e79139d1a89e2d076
font_02_sfnt_off0001247c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1247C 11536 bytes
SHA-256: 0eb302515f72630b9c7b1ae87a841e9e5a8e67aff686985af4bce1c6304c2170

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