Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3a5e51f037bb69f…

MALICIOUS

PDF

79.3 KB Created: 2021-09-02 17:33:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5ab05bf816ecd17f4e197486404f772c SHA-1: 4541a3daf3ba892e4a5bd1f2f95ddeeef9e6f868 SHA-256: c3a5e51f037bb69f2ff505c3eb8ddf1d2bb29dee458d32f833b13b63ed9008f9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file exhibits characteristics of a phishing lure, using a link farm hosted on compromised WordPress sites to redirect users to potentially malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics, along with numerous unknown reputation URLs, strongly suggests a malicious intent to deceive users. While no scripts were directly extracted, the overall structure and heuristic firings point towards a phishing attack leveraging external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://area5srl.it/file/42763758926.pdf In PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca9777d905---96380382378.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec5124d49f6---nalojom.pdfIn PDF document text
    • https://tonthephunglan.vn/upload/files/tojifawagabonupev.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/a2ec22dae5608cdb1526353e0c44fb7f/limaneni.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/kimedigukusakopuzabenopu.pdfIn PDF document text
    • https://noddy.nu/images/file/29478656238.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/4e6vpgare5c4kcvhqkhh21u5c6/7843100336.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/857d7410333d4459dc617964a63bff14/1749898445.pdfIn PDF document text
    • http://zvezda-rostov.ru/ckfinder/userfiles/files/6375066658.pdfIn PDF document text
    • http://gilendor.cz/userfiles/file/lexutolufuja.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/wezenobajixak.pdfIn PDF document text
    • http://laclonghotel.vn/upload/files/24499116634.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a15ce3cbdb---43397268252.pdfIn PDF document text
    • http://fertilityupdates.com/userfiles/files/tufawaguwad.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/66844647671.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608e69611f06d---degukatemepuzerimexabafe.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/h1inpgcitg499693sm777jng9v/4602264269.pdfIn PDF document text
    • http://avonsteel.com/UserFiles/file/62150717046.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e36f625ba90---tenirexotifigebuj.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/b02aet8p3g4iv4kb8jbvji2tea/dawokasej.pdfIn PDF document text
    • http://deborahkay.com/ckfinder/userfiles/files/gofizawujirexitipo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=download+software+pdf+to+ms+word+converterPDF 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_off0000cfb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e7ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7CA 10844 bytes
SHA-256: ff8dd3aa5c92cb5e93060f13c6687849921972c0cee0fb6d81744a3bc5e6b4d3
font_02_sfnt_off000100e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E2 17748 bytes
SHA-256: e4f3c5d207faa599fb65f9abc9e3366322e938fbe18e385be7ba3d02b08f0f02

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