Malicious PDF — malware analysis report

Static analysis result for SHA-256 8048d9a09e2a9768…

MALICIOUS

PDF

79.4 KB Created: 2021-09-08 02:26:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c6ffb8068aa664e88996f31e0ba0593a SHA-1: dd0e0063a46e17b1cf199314da3a8d5f11f22307 SHA-256: 8048d9a09e2a97687ef226e6490bc49a3128550714294bded924b22984e85fe8
176 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically for phishing and hosting links on compromised sites. The embedded links, including one pointing to a compromised WordPress upload, suggest an attempt to redirect users to malicious content. The presence of numerous links and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate a strategy to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://ketchas.ru/uplcv?utm_term=tp-link+wifi+extender+ac750+re210+manual PDF link annotation
    • https://capecoralliving.com/media/file/7992533466.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/e42c89b6788611811cced3d80a2d1255/kozaxozixukog.pdfIn PDF document text
    • https://maturana.cl/upload/file/92953490880.pdfIn PDF document text
    • https://permargi.com/files/galeria/files/20422132408.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8ec36c2ec5---tedawevorukinogifu.pdfIn PDF document text
    • https://petrovsky14.ru/docs/files/xolafepux.pdfIn PDF document text
    • http://studiopedrazzini.eu/userfiles/files/51604520243.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9691e1ae30---sofifawo.pdfIn PDF document text
    • https://kp-bs.ru/upload/files/likebitafelobazujabasuf.pdfIn PDF document text
    • http://ticaproduce.com/ckfinder/userfiles/files/jusuzamapijamir.pdfIn PDF document text
    • http://hwayinn.com/image/files/20210713_103606.pdfIn PDF document text
    • https://papersacksfactory.ae/images/bulk_images/files/taxudulivilexelokidawi.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160803c834dd64---91453851188.pdfIn PDF document text
    • https://triangle-electronics.com/assets/userfiles/file/dodowimuzuju.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/2d0ba33875650521671deda6cfeeea9b/75898817163.pdfIn PDF document text
    • http://capital96.com/userfiles/file/jukow.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/o7huagkqkv1rg4q7puf0laru8g/61446188701.pdfIn PDF document text
    • https://valleyrestoration.net/home/apf/public_html/ckfinder/userfiles/files/xixebetebojowemedani.pdfIn PDF document text
    • http://faradbox.pl/files/file/27275567876.pdfIn PDF document text
    • https://daks-96.com/f/uploads/files/91992678790.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0f9f1c7b3---95810080412.pdfIn PDF document text
    • https://clubon.top/uploads/files/21620605351.pdfIn PDF document text
    • 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_off0000cb6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB6C 18364 bytes
SHA-256: 2eb52af6623e8e0fd74f8696a90a2a4fde669a1ad3f3ecddf1f163c3a56a6b0c
font_01_sfnt_off0000fb0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11325 11348 bytes
SHA-256: eba5c0d782b7baabf721d7eed1857db88e46490e757aa0294a1169151198cd2d

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