Malicious PDF — malware analysis report

Static analysis result for SHA-256 13cc27bd3736b524…

MALICIOUS

PDF

82.3 KB Created: 2021-09-01 23:50:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 13d6f8a01fa5a67edf7feeb4e528b597 SHA-1: c2f2baa1c5be0a75216fa87c79cdadb07169980d SHA-256: 13cc27bd3736b52400fd5fd6a906054b8ded201cbc484cf2af8cffb170e7df93
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of numerous unknown URLs further supports its role as a lure for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e4d8e907c7---52848795393.pdf In PDF document text
    • http://doggystylzgrooming.com/admin/photos/file/minidapebipit.pdfIn PDF document text
    • http://massimoandyuethui.com/clients/69227/File/furovesunixusokasivo.pdfIn PDF document text
    • http://klpa.net/userData/board/file/xufaxaselewuv.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/detebalaxijow.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/1306199653.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/94c6f128d9c6d75c6f3927b220d41a16/33772164238.pdfIn PDF document text
    • http://dryoucosmeceutical.com/userfiles/files/63051508273.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/ronutugonujeberoxapazuw.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e1022db690---pituwujela.pdfIn PDF document text
    • http://miroslaws.com/ckfinder/userfiles/files/zipibisuzeza.pdfIn PDF document text
    • https://baobiachau.com/luutru/files/90277595131.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/58223660614.pdfIn PDF document text
    • http://modaxch.com/userfiles/files/joladusosinagamijoxanog.pdfIn PDF document text
    • http://raisemoneyonline.org/clients/6/69/691275cf9a36cab982b2498ebdc715be/File/94790114531.pdfIn PDF document text
    • http://sbsinternationalschool.org/sbsisnew/userfiles/file/31358852984.pdfIn PDF document text
    • https://giridhareye.org/ckfinder/userfiles/files/5618867886.pdfIn PDF document text
    • http://sofia-es.tokyo/yamituki-n/uploads/files/90574541975.pdfIn PDF document text
    • https://cherrychile.cl/cherry/uploads/contenido/files/80942897016.pdfIn PDF document text
    • http://mbcasc.net/imgs/file/bonevirobegolowuxuxe.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/meh8jj1jver59p7ga53eua7bm2/gotirufa.pdfIn PDF document text
    • https://visualarchive.bg/files/madenupekasa.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d8a537680---63339796106.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/pibejawevuneb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=factors+and+divisibilityPDF 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_off0000dc21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC21 18056 bytes
SHA-256: de1a069c4203c117e569c88b968bc3771b07b58459e77cfb5e7fe927edc0f5c3
font_01_sfnt_off000109c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C9 10528 bytes
SHA-256: 2a1f272b92401496bb6a8f5c9a6eb9c7841321c8adac073bce75ade4a4b559f1
font_02_sfnt_off000121e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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