Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a91325e2ea56574…

MALICIOUS

PDF

69.4 KB Created: 2021-09-28 11:07:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ebc32caccbf202ba3ba413fc4097231b SHA-1: d1d12322262ba85ffbabe8e81229507b1e7378af SHA-256: 7a91325e2ea5657454a894e272550b8a5c5c9ece1489e16bb6d9c4d0d98cbd8e
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple disposable domains and compromised CMS upload storage, indicating a likely phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the structure and URL patterns are consistent with a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://fine-trading-knotwork.com/uploads/media/25249524695.pdf In PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/161341ea501fe1---goxoxitasevuzaji.pdfIn PDF document text
    • https://aymexco.eu/ckfinder/userfiles/files/lejevuvazun.pdfIn PDF document text
    • http://klm-co.ru/foto/ck/files/lajixemajinedex.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/sexerekanebijetulafasuku.pdfIn PDF document text
    • http://sage-chem.com/image/files/20210920_082047.pdfIn PDF document text
    • http://debsecond.net/UserFiles/File/38181603480.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/161429fed26b96---99013065403.pdfIn PDF document text
    • https://techlan.pl/files/file/romexalu.pdfIn PDF document text
    • http://diagnosticaedilizia.com/userfiles/files/zitagekevolozagekix.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/16141a4130f428---guwivo.pdfIn PDF document text
    • https://96662888.com/editor_upload/file/kuzobevaserejivexazaruwu.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dbed7060ec---34805112103.pdfIn PDF document text
    • https://olajpark.hu/files/files/gigafixuzebe.pdfIn PDF document text
    • https://viscom.bg/uploads/wysiwyg/files/44300496626.pdfIn PDF document text
    • http://movesearchesuk.com/userfiles/file/54947362499.pdfIn PDF document text
    • http://kancelaria-perfect.pl/app/webroot/media/files/nomuvamezebomanes.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/13516857668.pdfIn PDF document text
    • http://vinhomeshaiphong.net/app/webroot/img/files/lozedi.pdfIn PDF document text
    • http://prospekt-rostov.ru/ckfinder/userfiles/files/61294032111.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=fifa+16+apk+downloadPDF 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_off0000ad4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD4B 16956 bytes
SHA-256: c1f9d67dd1b7ee2c0639f8a9b997ca9810fba10a35fcb9efc6ce071ef6984c8c
font_01_sfnt_off0000d8f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f10a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10A 10368 bytes
SHA-256: f0b871229a771f7d7c045254c757afac299aa250f57628837870d2c24d913f77