Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e859c435d8a9846…

MALICIOUS

PDF

83.1 KB Created: 2021-09-04 09:07:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9ba8597a5228b64b864643be98fb4b02 SHA-1: 6eb2f1656eaead5e39357d4205a0ea0438f38095 SHA-256: 3e859c435d8a984685f144afef76993ee29dc3e7e58325534f13ce36ab4e36ec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous embedded URLs pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution campaign. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, lacking clear user-facing text but containing numerous links that likely lead to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://garglob.ru/uplcv?utm_term=extract+data+from+pdf+to+excel+using+vba PDF link annotation
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/lk7aakgatageaum61re6f2sn00/68772389194.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/d7f3f05f351a882f285b2f9d097c66cd/jugotukipejizifaka.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/c705456447cdf6ba4ac3650fa068678c/4753331083.pdfIn PDF document text
    • https://actorconseil.com/files/file/dusulokujuso.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e12b621c8---fepularupomoko.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/wivivufiwepepabenadajosu.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b53ea1547---vamaweseregitadugikakasu.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/b8775c9a3f7b684b34f7ff4150f57952/woveminumu.pdfIn PDF document text
    • https://chulintemple.org/CKEdit/upload/files/28163864017.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1610cdd6b092b8---52331041110.pdfIn PDF document text
    • http://elateridae.com/images/FCKeditor/file/fetofud.pdfIn PDF document text
    • https://actor-conseil.com/files/file/didarexijapowigapux.pdfIn PDF document text
    • https://mogilew.ru/userfiles/file/luvasemezetubipola.pdfIn PDF document text
    • https://aqualibramontois.be/fckdownload/file/tuwatonuv.pdfIn PDF document text
    • https://unicon-msk.ru/data/files/wokorememidifefugezopi.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/suxulamuwozu.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/1c0d6dcb110474a953a6430d40e7217f/2126633176.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de0806def4a---japiwawutaf.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/c4614d938d79367eb1f19c75cb75db0f/71750953573.pdfIn PDF document text
    • http://ekhoron21.mn/uploads/files/79688188719.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/silofu.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b59ff486b00---76406026183.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c880abbc5f---marus.pdfIn PDF document text
    • http://thamcohoaian.com/webroot/img/files/80650798140.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_off0000dda6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA6 18164 bytes
SHA-256: 5af85f1fe08c8fb05bf67638766afc5d6947594d140706775d845212341d2f74
font_01_sfnt_off00010c5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C5C 11356 bytes
SHA-256: ec44abd0d92a3d6bbb1f37af436616a493dc109ed0f2ef3f8a5bf307e6d5b330
font_02_sfnt_off000126ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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