Malicious PDF — malware analysis report

Static analysis result for SHA-256 217ac624a18f7972…

MALICIOUS

PDF

81.8 KB Created: 2021-09-05 06:30:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 88ec875b63b3a8cd6a4691625b6e4112 SHA-1: c9874e16936b6bec1aafae224803dd76598d4d0a SHA-256: 217ac624a18f7972fc50e262bdf415ecf3541e65e7e23f0d82277c48fc620be0
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains multiple external URIs, including one pointing to a raw IP address and others hosted on compromised CMS uploads, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links are consistent with a lure to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160af7c5bd0ee4---59076163253.pdf In PDF document text
    • https://www.hkfew.org.hk/ckfinder/userfiles/files/51344244588.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbadd210a0---31443197959.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9221ad1f07---vovelupuregovagilegawino.pdfIn PDF document text
    • http://140.121.125.49/ckfinder/userfiles/files/20210718_142917.pdfPDF link annotation
    • http://gdaniec.com/upload/files/9673184062.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/4rhstul4dj1aklqdgkfmm2p9mn/nepotorilasisekinelef.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/189bb7348947e998fb79b134efab3fe3/xufobenozifixubimilisas.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/enoepljkn7k4svsehqs61897d4/6880652572.pdfIn PDF document text
    • http://madiran-cruduparadis.fr/ckfinder/userfiles/files/27244190340.pdfIn PDF document text
    • http://prepearl.com/uploadsfile/6506521396.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071b5eb3d84a---39050272874.pdfIn PDF document text
    • http://sinching.com/uploadpic/files/202108122352056083.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4b46ba2eb8---zuwanoxuvuminomifires.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/ad65c9d17d3e1f80afa5f8b261b20bc1/61628590797.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/10348587168.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161185a400667d---gesun.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160781eb141dc3---67926808963.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/7ad5acfa227827922e354cc816bcc3ce/povutemipogubonoluxanakab.pdfIn PDF document text
    • http://fgosvo.ru/files/files/virasakonurijoxujovaj.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9d9547d05---45739828989.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095ce1de115b---3740616119.pdfIn PDF document text
    • https://cape-electronics.com/media/file/64325279361.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/b6df9e6587dae781eda7c9a3310b40bc/50606625229.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=ulysses+poem+theme+pdfPDF 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_off0000dca5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BC 10428 bytes
SHA-256: b0e69ba3a952b3cc94cda9d7f164f54ff9b164fb4ac10f6bcefd9ec035070013
font_02_sfnt_off00010c5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C5D 17808 bytes
SHA-256: fc3053f40c84960f6fe68fb56ea0f51f6093b151b490579ea072af2a6fbf3858

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