Malicious PDF — malware analysis report

Static analysis result for SHA-256 513a275d5687417b…

MALICIOUS

PDF

81.5 KB Created: 2021-09-07 02:47:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f3806c26d05d0d443c975f34ce6b9eef SHA-1: 5c2ded6b2514b84d69a6d25db5d4ea06a61c37a5 SHA-256: 513a275d5687417b9568233a1ff1c6f47fd83664b2905f759a4d1e0d9b7faf9e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm with numerous URLs, several of which point to compromised CMS uploads or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated, preventing a clear understanding of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://digitaldaya.com/imagenes/file/gudijelivezuw.pdf In PDF document text
    • http://handbook.hu/upload/page/file/84788701545.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/files/rotumito.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/51169289752.pdfIn PDF document text
    • https://ayurvedaemart.com/uploads/file/gotebidofidabawazutus.pdfIn PDF document text
    • https://prcomponents.com/ckfinder/userfiles/files/36852575968.pdfIn PDF document text
    • http://fusen-es.info/yamituki-n/uploads/files/rodawofawezutiv.pdfIn PDF document text
    • http://71mhsreunion.com/clients/f/fd/fd19d29f3ef40f7e1d0269d1df38e7d4/File/vatebesap.pdfIn PDF document text
    • https://appchecar.com/ckfinder/userfiles/files/63537976247.pdfIn PDF document text
    • https://coastalstudio.com/images/main/file/dovaf.pdfIn PDF document text
    • http://nordicaluminium.ru/userfiles/file/nedilu.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16130b4388984b---vorezegimaleviwukudotivi.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/41993628839.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/4746f19f0d169aadd86bd0ef1ce1ee37/10281135449.pdfIn PDF document text
    • http://kbidc.kr/upload/editor/file/1630653987.pdfIn PDF document text
    • https://vnmmalta.com/userfiles/file/82313504200.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074b580e9aca---61214486929.pdfIn PDF document text
    • http://print-printonline.com/ckfinder/userfiles/files/17410143197.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d42e79ec7d---94497740181.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16095fab6be821---tedos.pdfIn PDF document text
    • https://laznia-radom.pl/userfiles/file/63479149061.pdfIn PDF document text
    • http://ychnjl.net/userfiles/files/34824769029.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/alc4v5l5btvh2cf0st0596va3o/puwikoxod.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/wovujofure.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/dfae2b20d9232262e0234367edd080a2/poromobarimiwurita.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=saying+in+english+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_off0000d8ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8CE 10648 bytes
SHA-256: 33421004714151363cd0c9dd78ab6d002bd48fe8d171e15dfe96a90d3985706e
font_01_sfnt_off0000f0d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D3 18228 bytes
SHA-256: d11d92ac80063d674753c0d91e1844f63afd4a8c20521abcfb2cf5328aa3c513
font_02_sfnt_off00012021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12021 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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