Malicious PDF — malware analysis report

Static analysis result for SHA-256 33de7345ac29f5a9…

MALICIOUS

PDF

90.2 KB Created: 2021-07-18 23:50:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d6fb5cf02c5c8148f5d256f2669a52ce SHA-1: 01975a59cb0c814ae5d64ed2b6cc1f5822f0a16c SHA-256: 33de7345ac29f5a966ffb41590f10ae8dd95f1dd68f4da7b777ef358ad74aa0f
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised websites and potentially disposable hosting, which is a common tactic for phishing or malware distribution. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest this is a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://pvhs1967.com/clients/a/aa/aa78cb05297cd93d8a9ab6bd1eb8a3c4/File/24161157819.pdf In PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/08e0d0737723e97ea56f95eabae68221/fumotap.pdfIn PDF document text
    • http://traslochimontalto.it/userfiles/files/medorulenaxi.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/f2dd02781efe45c324642535aa15103a/82942168302.pdfIn PDF document text
    • https://annjulieskarpmo.com/userfiles/file/zewagesirutilelafonuropeb.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/45050757406.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16075a5281d07c---wifalofinasigox.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/67120253880.pdfIn PDF document text
    • http://kmbb.at/userfiles/file/29366997759.pdfIn PDF document text
    • http://ghioroiu.ro/sites/default/files/file/51121496498.pdfIn PDF document text
    • http://aquatrustfina.com/userfiles/file/solobipejojemirujulo.pdfIn PDF document text
    • http://hoangle.vn/uploads/userfiles/file/javalesimexitikasubutigep.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/vuwabujiboposemuj.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/g1nltk4a8sp9d282lbc78o9tb1/lufumifude.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/jjd9uc6089rs13v5knfimi0bj6/fafalawube.pdfIn PDF document text
    • http://greathorserider.com/ckfinder/userfiles/files/zuxofomulefilitagow.pdfIn PDF document text
    • https://aneri12.cz/res/file/jovolijimujaxirixipixa.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4ebc150abc---vewaxelejaxopenevifupaz.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608ffa74c3f8d---beripedenoleb.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog//file/52262197598.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f223a3f340---39312661126.pdfIn PDF document text
    • http://healhumanity.foundation/userfiles/file/74369512192.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb075d018cd---fomizexufaniduvipofuwuli.pdfIn PDF document text
    • http://magendans.com/imagefiles/file/62952470732.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=bulgaria+national+parksPDF 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_off0000fd89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD89 10540 bytes
SHA-256: da14e214ce27a43b7ce12bcaa06d851d05a88516de5a67e54b80963691b0a1d3
font_01_sfnt_off000115b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115B0 17032 bytes
SHA-256: 83fda26960835b7324ec73e03f7054426652d198c2ecd854d05cbd533c8d850c
font_02_sfnt_off000141ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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