Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1be31ae7392d153…

MALICIOUS

PDF

319.3 KB Created: 2021-06-25 13:56:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-24
MD5: 57398eddfe1a99b5b61190d3cc3b063f SHA-1: dbafe24b08e3f605ae2aa339a7f1afcde5b3d8c6 SHA-256: f1be31ae7392d153c2cf46cec3e9a2b9d1b80970c91f02da60a32d71cd39f6db
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 5

  • 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.
  • 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://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd75990e6c---setifovu.pdf In PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606dc2e535ec3---jikajibijusasusit.pdfIn PDF document text
    • https://topupdana.com/contents//files/34690176251.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4ac2c4e7d8c0b60f6cabc1117b6278dd/samogopo.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/75382094579.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/mitejuwowobomobu.pdfIn PDF document text
    • http://abwmarlboropike.com/uploads/files/97745502720.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096ab93c6449---mugipojuvumidar.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/34457256824.pdfIn PDF document text
    • http://edgecs.net/documents/56795306543.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16086bb747897b---turozixumumulepujebik.pdfIn PDF document text
    • http://wtmongolia.com/materials/file/xopinisotabuvizebotokeko.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/8b4a4f3a88a7bc1f19437c4a89cfc4d8/11425846812.pdfIn PDF document text
    • http://thinhhoanggia.vn/Images_upload/files/suvivujo.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/g6agcm2iqs5hp9hf469g1ga636/xuzil.pdfIn PDF document text
    • http://www.emailposte.com/pictures/janodivo.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/sozujujagopudabix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=canticle+of+love+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_off0004939a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4939A 16832 bytes
SHA-256: d3732c35cd8006ce864cfde3c496382be5215bac28d482dc3d3dcd72742bbb76
font_01_sfnt_off0004bf73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4BF73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0004d78a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4D78A 10440 bytes
SHA-256: 7c32f2505a04f9c8849da58502f0e12dfc7fa558fa83d7782a9067e93357a24f

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