Malicious PDF — malware analysis report

Static analysis result for SHA-256 2218c8b96eae5692…

MALICIOUS

PDF

82.1 KB Created: 2021-09-05 13:10:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a18ddb47cd6cc681fa35b2ab3cd5f685 SHA-1: e10303ce6861136754cee6c68c6d287b3e089e3f SHA-256: 2218c8b96eae5692a6c15c31cbde6c1620b057c9d153813b49f62f7aa5fcac78
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, containing numerous URLs that point to compromised WordPress upload directories and other potentially untrusted hosting. The primary purpose appears to be redirecting users to malicious content, likely for phishing or malware distribution.

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 http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d03d614e125---dunogujej.pdf In PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160aaf96fbe661---32771846263.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/72122656355.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/21539164365.pdfIn PDF document text
    • http://feuerwehrobrigheim.de/upload/files/16269861960.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/161008f0bedfff---dixinab.pdfIn PDF document text
    • https://ngaa.org.au/application/third_party/ckfinder/userfiles/files/ripiz.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f34a80b5901---94770341581.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c429f3632f4---gisen.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/43880097106.pdfIn PDF document text
    • http://otczenacts.com/media/files/4848701075.pdfIn PDF document text
    • https://infiniteprospects.com/FCKeditor/file/86149402867.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/jotutugidewekerivadogoli.pdfIn PDF document text
    • https://dietacud.eu/upload/file/89736939770.pdfIn PDF document text
    • https://indianpowerliftingfederation.com/userfiles/file/98386546095.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/33973663845.pdfIn PDF document text
    • http://dsacare.com/admin/uploads/file/90604821245.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160abab8613d30---58832358727.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16084da7c3707b---luronow.pdfIn PDF document text
    • http://palenice.net/obrazky_clanky/file/93069822052.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/elepq6m3f309k1p5pv8o2irmr6/42532501074.pdfIn PDF document text
    • http://leadershipcareer.kr/fckeditor/_upload/file/bupiviwoxuxamepufifatar.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/sewugigabumifa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=articles+a+an+the+worksheet+for+grade+2PDF 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_off0000da5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f26c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF26C 18008 bytes
SHA-256: 1772f5a44bd530e1f27843d74be2ec254650f6003f93d816ffb9444169c0f83c
font_02_sfnt_off000120d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120D7 11036 bytes
SHA-256: 74b544308c31996d1888f3534e52aa315d658cac5a191a3e08f20f025d1d4fea

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