Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8ff8f5c8393e044…

MALICIOUS

PDF

101.2 KB Created: 2021-08-14 16:35:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0a6552aabbb4a168c801c40422a5c76d SHA-1: bee87f8c393ada4995942a1e1a56cb88a9e2801a SHA-256: c8ff8f5c8393e04421e0035ca5cc77f1a54658fe0cf9b541d114ddbd8419e06f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress upload directories, suggesting an attempt to host malicious content. The presence of embedded URLs and the nature of the link farm indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098bf045d166---xizisotomunofila.pdf In PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160811040574ed---bulujujupefinopebip.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160f5fbe747ed3---vebekagi.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e61b8b211f6---tizibopufip.pdfIn PDF document text
    • http://hochrainer-elsner.at/upload/files/laraj.pdfIn PDF document text
    • https://www.letspassdriving.co.uk/wp-content/plugins/super-forms/uploads/php/files/kiq89idl86e8g9nb6q8fioher0/budetibunesotiviwub.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1607cdcf359069---21860048233.pdfIn PDF document text
    • https://dcmheavyequipment.com/admin/images/file/tolipalolorixunezid.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/083d8190e041aa95f38e5e8def0d2047/wejuwosofigigugo.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8f772ea50---bafafe.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c926b070f---porikoge.pdfIn PDF document text
    • http://xn--rssx31a7tec6p.com/upload/userfiles/files/20210728051211.pdfIn PDF document text
    • http://sineadstone.com/userfiles/file/fowimugos.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/3049b6236399b19d59c0fd6e0d44fb57/kunonuta.pdfIn PDF document text
    • https://cfbadalona.net/ckdata/files/lobujev.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d06dfaad533---nikunimewumagazakomu.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/dc95bcf989b80abca3e90d06f367c2b9/zodus.pdfIn PDF document text
    • http://wxjsyd.com/userfiles/files/vojekapaguzob.pdfIn PDF document text
    • https://kopari.hu/files/file/notik.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/wivoxanumejumuduxivosi.pdfIn PDF document text
    • https://girilawfirm.com/content_files/files/50028480630.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=dave+chappelle+equanimity+mp4+downloadPDF 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_off00011ed2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED2 11100 bytes
SHA-256: 8136868714ed37575be2bd69e62f50347fdce6238f2565f33e1d49691b818fc7
font_01_sfnt_off00013865.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13865 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15077 19820 bytes
SHA-256: 2997a6bdc5fa746d145d86783a8b58753ec3cd8a4441fc4cd65b1cf5855388bd

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