Malicious PDF — malware analysis report

Static analysis result for SHA-256 a35e3e7d419dcec3…

MALICIOUS

PDF

85.1 KB Created: 2021-09-03 22:19:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f2e48eb03f62cb15332d7358e4184efc SHA-1: acc4aa0996d4cbb6e27d60fb72b85b9a74193373 SHA-256: a35e3e7d419dcec3ac875fe4c68de11342236bc58e64aeb08d25fc939b8fdece
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution lure. The presence of external URI links and link farm heuristics indicates an attempt to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://designklasse.de/ckfinder/userfiles/files/domerebugijabinixev.pdf In PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/ju364e7j5uutsu8ekeec5aaaf1/jiwejagemekumiworudusupaz.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/loc57qsraqlg1k727kba85rji4/81101965073.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/b3ed90dfb6695536baa4e65a5e3bad0b/91330295240.pdfIn PDF document text
    • https://istanbularicilikfestivali.com/upload/ckfinder/files/tupubujojadozutap.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/jc3u2nmgbb5o1kf5p3krb4chlk/zexowodagizutosivedevari.pdfIn PDF document text
    • http://mindatpeace.us/uploads/files/89823488010.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1610a895092af0---46329346663.pdfIn PDF document text
    • https://stmarys-perthamboy.com/upload/File/gifozujezizezafug.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160920c2ae7bd4---ledamemaragoruweri.pdfIn PDF document text
    • https://natatourism.com/userfiles/files/xezerofozodajinofuroju.pdfIn PDF document text
    • http://naphotelbangkok.com/userfiles/files/3958361922.pdfIn PDF document text
    • https://wedding-photos.cz/userfiles/file/gigirorepep.pdfIn PDF document text
    • https://tanasiri.com/piceditor/file/parokagiz.pdfIn PDF document text
    • https://www.passion-rnd.com/upfile/files/2021/07/19/36938255836.pdfIn PDF document text
    • http://box8websites.com/ckfinder/userfiles/files/lutev.pdfIn PDF document text
    • http://amsuatrust.org/survey/userfiles/files/41896913045.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/7e442d895e735fc3b4dc28cc5c810495/24067805216.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607899f8dc29c---zifezisimajebedos.pdfIn PDF document text
    • https://nasco-ye.com/uploads/file/niwivemigemedok.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/cba6ko4h1ro97roud0ha8fgo8b/lofaxaninumopugi.pdfIn PDF document text
    • http://artediapharma.com/upload/files/5575230004.pdfIn PDF document text
    • https://bluza-shop.ru/content/File/24238770544.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/sudivovizesas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=hymns+ancient+and+modern+1861+pdfPDF 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_off0000e26e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE26E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA85 11268 bytes
SHA-256: 54bb263b89a28c23269d4ece2e133477825feed33648a5721c72ab9949365740
font_02_sfnt_off000114f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114F9 18156 bytes
SHA-256: 8eafcf84f264cbdf167a0a87620b0d414c4b7f7ee6e691f1871f8d401001d929

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