Malicious PDF — malware analysis report

Static analysis result for SHA-256 e64ac6623145b073…

MALICIOUS

PDF

84.3 KB Created: 2021-09-21 08:25:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: a3314279dac34db1e43e91f1d97e0764 SHA-1: 4e2ed9ac18021ce5c3fb4a6d63b11a2ba2776950 SHA-256: e64ac6623145b073af6fb9d62e51d0049cf4497fafe1dadcc92ae60ec64f763e
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable domains. Heuristics indicate this is a link farm designed to direct users to external content, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://drafthe.ru/uplcv?utm_term=media+mix+pdf PDF link annotation
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/509aa268de42e876c8dc459b25d929b8/masiwuzejazatonoxobul.pdfIn PDF document text
    • https://thietbixaydungcantho.com/canthomobile2/public/images/sanpham/files/89922753551.pdfIn PDF document text
    • http://angelofthewinds.net/ckfinder/userfiles/files/75601719252.pdfIn PDF document text
    • http://skomi.ru/img/files/file/81730907753.pdfIn PDF document text
    • http://livelyway.com/ckfinder/userfiles/files/7080553220.pdfIn PDF document text
    • http://bdsductri.com/upload/files/3995593336.pdfIn PDF document text
    • http://www.ruben.pl/ckfinder/userfiles/files/forazimetalarelap.pdfIn PDF document text
    • http://studiotecnicomancini.eu/userfiles/files/jifepibakizazeduwoliluxev.pdfIn PDF document text
    • https://west-holding.com/userfiles/file/38007597534.pdfIn PDF document text
    • http://sochi-riba.ru/ckfinder/userfiles/files/27709936300.pdfIn PDF document text
    • http://www.accl-calibration.com/login/ckfinder/userfiles/files/sakazenubuxisuwagafaruza.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/bf24423bf65e3db0993a96eed94f5eb0/51823515249.pdfIn PDF document text
    • http://symbolfoods.com/files/file///39023467368.pdfIn PDF document text
    • http://gyndoktors.de/ckfinder/userfiles/files/suketevoruxuvowudo.pdfIn PDF document text
    • http://universalgroupautos.com/files/others/wekaduruxetaxalizibu.pdfIn PDF document text
    • https://millvalley.com/wysiwygfiles/file/9030674845.pdfIn PDF document text
    • https://fcksa.com/ckfinder/userfiles/files/nozufuxorexapajiwisiwuk.pdfIn PDF document text
    • http://atem.sciara.eu/public/upload/file/79500189633.pdfIn PDF document text
    • https://semsaesp.com/ckfinder/userfiles/files/3725144851.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161382a4c98328---vojojodananivet.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146f5bf56f3b---33908734269.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/a31c67c7859b3097f6d6b635c97244e1/87164733984.pdfIn PDF document text
    • http://www.oe.com.tw/ezadmin/ckfinder/userfiles/files/rijodumuluzexuzaxati.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_off0000e699.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE699 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000feab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEAB 18380 bytes
SHA-256: 4c52586bf5f42288c383ef557ca5516ca2df1c93290249a613d2cd67cdf197ed
font_02_sfnt_off00012d41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D41 10116 bytes
SHA-256: 082f6984991ab34b68a41eaca30b1d2b60e9c87d42376cb952efc1d948b50e79