Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd2257c2d31b7e56…

MALICIOUS

PDF

83.2 KB Created: 2021-08-25 05:55:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5225709bd6275e75ef1f399eb0a91846 SHA-1: a6b81dc3e198000abbacaa1ec575b1cbaf5b70d0 SHA-256: fd2257c2d31b7e56b0cfccee80206fe042407a09bdc9a2bc1d7872259d8bc741
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16095b86731572---tixazubuxama.pdf In PDF document text
    • http://penzionnakrizankach.cz/ckfinder/userfiles/files/zetixumusiboxafizel.pdfIn PDF document text
    • https://feltshoe.com/userfiles/file/52354723238.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/f43c360cb234b6dd48404c927c3367bf/dexegimoribibusinaf.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/1fa17dd3ce7d21138f596e796872da2b/71584785664.pdfIn PDF document text
    • http://goldway.jp/upload/board/file/3421810114.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/72917cebd519c424d1f9a884848883c9/37099918439.pdfIn PDF document text
    • http://cathugo.de/res/wysiwyg/file/27826119962.pdfIn PDF document text
    • http://sevennews.com.br/ckfinder/userfiles/files/viwitukixudunidojisu.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/vizebilebazewune.pdfIn PDF document text
    • https://unique-u.biz/images/uploads/file/2745282187.pdfIn PDF document text
    • http://3suntech.com/UploadFile/file/20210704202735133.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/e14fbf99f5f577d67de36009592d1a92/72909688488.pdfIn PDF document text
    • http://nsk-nalogov.net/upload/files/wogifaz.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a24a976ce1b---tabudivudivurixasugavupor.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d056053c4e---78943478381.pdfIn PDF document text
    • http://ciskmv.com/css/file/fotutefak.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160debcb6788a2---wepanitoxi.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/7jd5i7mrbnbqp11meunp79r57p/mexapivewozimofadip.pdfIn PDF document text
    • https://akemi.ro/hirek/file/51608082991.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/4b1dc81bd47a00c6905966ab44f47849/fuzetexulunatezijupa.pdfIn PDF document text
    • http://www.colormotion.cz/UserFiles/file/nigezota.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/lopamejem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=list+and+arraylist+in+javaPDF 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_off0000dc25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f437.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF437 19360 bytes
SHA-256: fe5df612a505e1e000b99c031afaddbb72e391500bf9ca303ef4d9cd187f7ec2
font_02_sfnt_off00012610.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12610 10256 bytes
SHA-256: 548626b4c9ae5aa03c6c25286ec9c717d19299db3858ae5e8588418e0713edde

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