Malicious PDF — malware analysis report

Static analysis result for SHA-256 a83de0868ea40b76…

MALICIOUS

PDF

74.1 KB Created: 2021-09-23 05:16:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d1ad9371f34afe269987b089e64f5ab6 SHA-1: 565ef851846c60a39de6d8b516ecba6c7e63595c SHA-256: a83de0868ea40b761a4adac771a0a1104e08a4c375dcf2d22e38c48f2441e3c5
164 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to compromised websites hosting PDF files. The presence of a 'download button' lure further supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://doanekeyes.com/userfiles/docs/topuwivasekobalezekexa.pdf In PDF document text
    • http://yarpb.ru/pic/userfile/48302014080.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/gorokalixazolenek.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161308b028210f---wapixopifeg.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/gupolonewizugopirejo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613689e0a3164---4731088388.pdfIn PDF document text
    • http://drsrkbedcollege.com/ckeditor/ckfinder/userfiles/files/meredufejuvepibemawisavan.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161364d83e2634---39462780075.pdfIn PDF document text
    • http://thaoduoconline.com/userfiles/image/file/pipenizaribusomujis.pdfIn PDF document text
    • http://seidels-mineralienwelt.de/images/uploaded/file/99383889376.pdfIn PDF document text
    • https://ginniglobal.com/uploads/file/jowag.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/6c877489e5caa724a360bfe9fa369dae/76942810368.pdfIn PDF document text
    • https://weekendtripskolkata.com/userfiles/file/pilarefadedikidewajodok.pdfIn PDF document text
    • http://hingliltd.com/userfiles/jedavefebamedudema.pdfIn PDF document text
    • https://agmatbaa.com/upload/files/felukax.pdfIn PDF document text
    • http://reclameindex.nl/images/uploads/91630456512.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/47003512497.pdfIn PDF document text
    • http://ysmenmidwestindia.org/uploads/userfiles/file/file/mozusozozafufujeg.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///dejesexafimuwuranetunud.pdfIn PDF document text
    • http://scuolascifondocortinadolomiti.it/userfiles/files/22230232719.pdfIn PDF document text
    • http://toonesk.com/upload/7960220052.pdfIn PDF document text
    • http://dagmar-e.de/userfiles/file/gokizopa.pdfIn PDF document text
    • https://zippy-inc.com/app/webroot/userfiles/files/dajix.pdfIn PDF document text
    • http://supair-lux.hu/ckfinder/userfiles/files/64892525274.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=escape+room+2+123moviesPDF 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_off0000bab2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAB2 18316 bytes
SHA-256: 0ac8ee30f82fd9c09565c325f425418ad517c32a27770099c9f97fb2d33f520f
font_01_sfnt_off0000ea7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7B 10680 bytes
SHA-256: 6684549489b11b65e347e3e9405f91ee542a1285faaec56afdabefcd2d199e3b
font_02_sfnt_off0001031e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1031E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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