Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ab81837ef6e67b4…

MALICIOUS

PDF

87.3 KB Created: 2021-07-06 02:45:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 6c8cc3a33deadc18f8972efd1d1b4073 SHA-1: 8c262049cbef59f47314c767c65f551671e4cee6 SHA-256: 2ab81837ef6e67b40ce182cf1fc5bbb471a0cb0d4560aedbe2625ce6a04202f3
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous URLs, many pointing to compromised WordPress upload directories, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of multiple PDF link farm heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072fa01e6973---kebabaw.pdf In PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b04d161b029---29041496265.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/zexuvasijamuvomibasafapav.pdfIn PDF document text
    • http://okuninka-biale.pl/userfiles/file/45584106882.pdfIn PDF document text
    • http://alda.pl/ckfinder/userfiles/files/wojevekaxafe.pdfIn PDF document text
    • http://mileschapelcme.org/clients/9/9b/9b85db73e8c1d5ae3bc18b6db4f26039/File/16741453803.pdfIn PDF document text
    • http://vizesblokk.hu/files/file/tisijodusepofivifokoj.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a8cfd2bcd94---bidigaxiparedu.pdfIn PDF document text
    • http://haai.org/upload/file/46085697776.pdfIn PDF document text
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/ss5rpiaot8bh893pud3rti8asr/bodemafosafusepuxojeb.pdfIn PDF document text
    • http://kolasinprevoz.rs/slike/files/nerixokosejojemosunuto.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/mikujurapazorikovusu.pdfIn PDF document text
    • http://profitoolinfo.ru/ckfinder/userfiles/files/dezogusogewitisozosita.pdfIn PDF document text
    • https://arerp.kr/data/file///29593791247.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/b98752edb03ca740371bc3fb880b69f3/69446486259.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160931bec507b0---63988984771.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/89ce45c07635a3598435786b8c831bc5/nudimawupuritupaj.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beae075659b---85602173637.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/xixasisarunamejodejusomez.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e19306f7c---diduxipewusedikovi.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/e5172d69436f0def5858e852bda29558/momasupanewewevenoraj.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b93ed60c551---demif.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/a3eb48aab50e5d2750690a50dffe7327/dukefuxebe.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/95536318679.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=prostate+cancer+spreading+to+lymph+nodesPDF 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_off0000f24b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A62 11076 bytes
SHA-256: 38f3d4d84e34ed2bd9bc27688c70adfd82d333e959f34a5dc7b5572a9304f9ac
font_02_sfnt_off000123cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123CF 16784 bytes
SHA-256: 7e77b41fb5245a37f81661dc15bd055aa9974c2f94d85750f522002afd001a14

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