Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3aefd9b1e3d157a…

MALICIOUS

PDF

91.9 KB Created: 2021-06-28 18:59:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: f05eb1acc3bdb0d075314f65b9ab0e55 SHA-1: 1c12f7388947f9dc14c3a19b67d7d505b4b0abd2 SHA-256: d3aefd9b1e3d157afa50bc0da1b542aff53f9c54f0fdbb72ea4089838a5f828e
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm designed to redirect users to malicious sites. The PDF structure and embedded URLs point towards a phishing attack, likely using a spearphishing attachment as the initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://krisoc.ru/uplcv?utm_term=highest+weight+lifted PDF link annotation
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/fmji2pdsblead0amdn5ooohp55/9724031381.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/41081555558.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/gevusu.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/19816915435.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/1acef8b6ed83bae678aa66fb7780e32d/bokalazoponugegur.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b4db2c8cce---ginaripewusepeketogeb.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cb3424f2e6e---66103410159.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0bef8daafe---rozirigiratixivozoxasu.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160853252468f2---21934147802.pdfIn PDF document text
    • https://hagepoorter.be/files/files/sapar.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160976ca02f658---26692584500.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/0e43f1e422c84665fd96e63627c87dfa/85072031711.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/v9fpompq5nur7i1fj43jk2ds36/vazawenozewunasuxu.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a5c588b9cab---dezodove.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/ee2afaf5ecc7f00ae257f784d558b9dc/sinefonosediwura.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160720c3ca227e---13161344269.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/bd27ce0d74e20733b61cc66b741c8048/famejiz.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b964147a5e---mixewi.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/5008565a8ebca243070e01686881acca/zafogifuwupuxazetuke.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/c247fdd424b9eb014de812548f0082ee/21199828160.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/kunatibijasituj.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d390cb0ef2---99831236422.pdfIn PDF document text
    • 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_off0001063f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1063F 17340 bytes
SHA-256: a3d9cf3b6341f0093f7e765ee6259ba0c70f5f943229bbb418928194b92a0428
font_01_sfnt_off000133dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133DD 10224 bytes
SHA-256: 221b2fee6431fbf2d8e0da58083f8d0a98e5bd4e18437eecbb651b9f4ef31eaa
font_02_sfnt_off00014ab5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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