Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ee9663bc37ddd7b…

MALICIOUS

PDF

93.0 KB Created: 2021-06-26 11:05:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 88625544b7bb04b2edd5089bb8ded9e8 SHA-1: 27e8cef9fe7134f3aaf358db5c1b1bd9219a8c9d SHA-256: 4ee9663bc37ddd7bca6b3c14a0c53c1b27a4e3e91e3b172eb5937216d4a7cad3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics as containing a link farm pointing to potentially compromised WordPress sites. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. While no scripts were extracted, the structure and embedded URLs suggest a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9558

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/46ebq66un9gj0ofn8i87ec9ke4/4931333849.pdf In PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/3fd90e9299fc32c413ce3aa482f25b65/41853756620.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160793d0778b78---xorudeganorafodij.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b24ecae1276---36504707649.pdfIn PDF document text
    • https://alternatifhirdavat.com/upload/ckfinder/files/35767772929.pdfIn PDF document text
    • http://bsp-oblspl.org/ckfinder/userfiles/files/mewebuturavenatugenirifi.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/jc3tan9ujl1t4va9kqgtr24qc1/66631304201.pdfIn PDF document text
    • http://tingyi-bnb.com/CKEdit/upload/files/18781550959.pdfIn PDF document text
    • http://cheapmarkt.com/userfiles/file/gikofuzigamotagofuvi.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/kovexelakatamazukav.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c33b08e690b---86382151632.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608d0e25862f8---42192432293.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/50365631133.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/b869e2bf7a20adde3a5eff57d1a5c398/299616610.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/aef8d1028121cd42780d1fecc50b38d3/gopipabudapid.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16095c74a4b4fd---62699678414.pdfIn PDF document text
    • http://americanewbie.com/userfiles/file/67628191312.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b657b0870b9---tegunefewiniviturob.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/15859441554.pdfIn PDF document text
    • http://app8itebarandgrill.com/admin/images/file/bezinufaje.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/94859c8c7885a03cf7a05fb95e757cbc/86495972265.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/r6mnjrs80o4pl2vicvjo6lglv2/39285811907.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607313129e168---89935221354.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16087afadd7f7e---bupobetafinelax.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/03f541e16fd496836c605bdb0120d88f/wopewezerarowemiwi.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1609f4098183a9---jafat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=2020+tlvs+and+beisPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d07b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD07B 16160 bytes
SHA-256: 27fa49ca30b1f57c6e4f8b99ad1f73ead7010ce1f191e20d716503af09158f46
font_01_sfnt_off0000e5f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F5 10372 bytes
SHA-256: 5b7ca902eb9444adc47a4ef8120002d6e6f401aed334ceec6afc7aa0bf5b6c69
font_02_sfnt_off0000fd9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000115ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115AB 10688 bytes
SHA-256: 977eac03240aeabd9f68391c1775dd7119e8aee0bde8bee057ceadaae931d735
font_04_sfnt_off0001386e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1386E 17048 bytes
SHA-256: 63b65e2e6fb1b1d67529001630e1c0fc0fb108fe6bfb90010ad5502f8d02f105

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