Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae6649201c4fc829…

MALICIOUS

PDF

84.8 KB Created: 2021-09-24 06:37:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 651c4e849c3947199313bd2d3c231ecb SHA-1: 184ad613b1efa13ee441955e85e702130c5e1be3 SHA-256: ae6649201c4fc829216f5bded37169115d98795af5ec5b7f33a925f12cf9aedc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, and it contains embedded JavaScript. The PDF also features a link farm pointing to multiple disposable hosting domains, suggesting an attempt to obscure the ultimate destination of the malicious redirects. The presence of embedded JavaScript indicates an intent to execute code, likely to download and execute a second-stage payload or redirect the user to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://wct.goldcrownresort.com/magazine_files/files/59925542610.pdf In PDF document text
    • https://avukat.dnsaktif.net/upload/files/55194960851.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/laguraxarugugejixapugut.pdfIn PDF document text
    • http://myphamnanyno.com/luutru/files/48756748931.pdfIn PDF document text
    • http://conelser.hu/fck_uploads/file/nuxisadoragakiji.pdfIn PDF document text
    • http://hotspot-usa.com/js/upload/files/segev.pdfIn PDF document text
    • http://rurisnet.org/images/file/vobineliluteb.pdfIn PDF document text
    • http://reclameindex.nl/images/uploads/tosijibotisifos.pdfIn PDF document text
    • http://lisaarkinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pejazorilegamaganugo.pdfIn PDF document text
    • http://hutnia.pl/userfiles/file/28343353435.pdfIn PDF document text
    • http://naszemotyle.natura2000.pl/imgturysta/files/80784231764.pdfIn PDF document text
    • https://demo-calson.garment-pro.com/ckfinder/userfiles/files/sakazifaronaginoj.pdfIn PDF document text
    • http://philboyd.com/dulebe.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///37769410573.pdfIn PDF document text
    • https://lenaoyunlar.com/calisma2/files/uploads/fekaz.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16133373bc5882---mavurebevufavo.pdfIn PDF document text
    • https://ustunbilgisayar.com/userfiles/files/12483831212.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/12a06998d9ef7f59a502edb7724e1963/64787895886.pdfIn PDF document text
    • http://www.yeosung21.or.kr/ckfinder/userfiles/files/1630465214.pdfIn PDF document text
    • http://barbusci.it/maisUserFile/file/vetunubunewujolezewapa.pdfIn PDF document text
    • http://goldmustang.ru/files/files/48927213522.pdfIn PDF document text
    • https://asztromiskolc.hu/ckfinder/userfiles/files/23899038971.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613eea7aa09ee---mobojodebonigotovi.pdfIn PDF document text
    • http://realcomfort.ru/content/upload/file/94076820477.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=how+to+track+a+spouse+cell+phone+for+freePDF 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_off0000e684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE684 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE96 17608 bytes
SHA-256: f2e193e8d2394c04ad46b8962cdc24648136260687038a5e278071604aa9bce6
font_02_sfnt_off00012c8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C8A 10756 bytes
SHA-256: 3fca85f4b4d889c7c8e96297e9f02d345d1010a35adf1178aaecf6d94ff4b94c

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