Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d564ce98fb3e5ca…

MALICIOUS

PDF

104.5 KB Created: 2021-06-25 22:46:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 1ae88f9877cfcf2838b2d8cca155c3b8 SHA-1: 23734a294d8171c2ff281e09b0fc6b6667fc8a88 SHA-256: 5d564ce98fb3e5ca24534b59e9d58d78e209779b60f3fc51e786f9133da03237
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple links on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9790

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://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac6edab349---32312751574.pdf In PDF document text
    • https://frontlinetherapist.com/wp-content/plugins/super-forms/uploads/php/files/7a4140ec275a6790047ae334bb95c2eb/ruselari.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9166f6aafe---wukus.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/pateriwafax.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160708d0a2f3eb---jawerewitosenipevine.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160844825aecd3---43010576016.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/fa6e8c02223c686d86bec75930845cb8/33342324527.pdfIn PDF document text
    • https://bonafideonline.com.ar/wp-content/plugins/super-forms/uploads/php/files/45fb5e3de9ffc6333b14dfb8c555463d/78176804800.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/16078d54098179---xunusoteg.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/h722eg150s0fnes5dtomi3v0u9/70285420126.pdfIn PDF document text
    • http://cdn.eagle.mn/uploads/userfiles/files/garefirovusifixov.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/31811353025.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d43b6dddf47---48312548532.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab4e2a574be---61299648300.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e84d17716---33050687321.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/059d6ac13bd4f1a766156a09ad599780/milidatipibi.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe2f03a891---61106637876.pdfIn PDF document text
    • http://rocb-ap.org/file_media/file_image/file/50378675632.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/faguradanati.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/afbl72ike4vqll0o3sur7vnk2c/jugikijijigapojikoxoludob.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa03185e87---wamavilonor.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab53e711003---5118648158.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/ahr9kt66f3cshs9ggea5flh43q/wamilawivuleg.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/59050855502.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/3188531b34109654042b4d0241ca47b7/16400317166.pdfIn PDF document text
    • http://aylincinarli.com/fckfiles/file/xaxal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=free+music+software+for+androidPDF 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_off00013652.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13652 10752 bytes
SHA-256: 2d0131e96a4d2253ed9bb437b05af3cdc9f310ac1635adc9203dce4750bda241
font_01_sfnt_off00014f1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F1F 16804 bytes
SHA-256: 0084d756f6d57ed2b988d3e039ddde32c988c142933b94c24d1b26296f4cceba
font_02_sfnt_off00017adb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17ADB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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