Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecc100a0a709e83e…

MALICIOUS

PDF

88.5 KB Created: 2021-08-12 06:46:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ab2178be5df3af6e97335e251b2a419a SHA-1: 0788d8845637ada248cd2e9c118646121cb54a0a SHA-256: ecc100a0a709e83ef03bc60d16b3ad0cf8ba682af6c8e29bc7e5c1210356e51b
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary attack pattern involves luring users through a seemingly legitimate document to external, potentially compromised, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/tacetocjnb1891b98cf7fuj3e3/55479693183.pdf In PDF document text
    • http://merlegdoktor.hu/tmp/jigut.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f7a9cf438fe---zikigalikubizu.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076b9b16c7be---98033975958.pdfIn PDF document text
    • http://sunarfactory.com/userfiles/files/rirajudibigigol.pdfIn PDF document text
    • http://plncse.hu/php_data/file/datukatexanidivi.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ee75b71df9e---30535078154.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/mumifagule.pdfIn PDF document text
    • http://decom.pro/admin/ckfinder/userfiles/files/9012262175.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/213f052978763cf8566dbe690589cb02/47180829976.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/0bcab7ba656d94bf3b0f9b8d88039592/munevopizake.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/220664ebe766b9f056a10ecfba09e718/35702182596.pdfIn PDF document text
    • http://tvkinter.com/file_media/file_image/file/suvumuzazimiropabol.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/78ac152344a9da344f9febcc87e8bcd5/govurusilozutu.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/a69cd1179ca8a3cb83cd4d3788c47599/fenukuzenoj.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/43275285680.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16094395e01d09---gemuwedagemurexejam.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/a10cfd81a7fb031a6d51188121a5a7d4/sonovebe.pdfIn PDF document text
    • http://ghhs1968.com/clients/5/57/5762190d0a265df614d1f295a7060a42/File/86963371299.pdfIn PDF document text
    • https://energooptima.hu/upload/File/garivutinojuzugifori.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/kn4v1h9ui4ng24h9jb4ughs0df/tusojemerujusek.pdfIn PDF document text
    • http://chiaranannini.com/userfiles/files/71709041379.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/4c1d976609d97f0bf7c9283d93dbd99c/1857572943.pdfIn PDF document text
    • https://agmatbaa.com/upload/files/sumafig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=geograf%C3%ADa+del+mundo+kapelusz+pdf+gratisPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC7E 11192 bytes
SHA-256: 00ba3890aaa1694bbfcbd669f4a8b05534adb110ccb25eabeb78df9577727e6c
font_01_sfnt_off0000f681.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF681 17236 bytes
SHA-256: f5bf11cc4672538ca793d4447e85496bd0e9ae5840ec29da3c85b4274648a8c3
font_02_sfnt_off00012411.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12411 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
font_03_sfnt_off00013956.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13956 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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