Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ea4ee6cad8673d4…

MALICIOUS

PDF

82.3 KB Created: 2021-07-01 12:47:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a4d8dddb81e3f43771b5df7334c32748 SHA-1: 6b1d15b4333332b36886eca42b009c4e99ff890f SHA-256: 9ea4ee6cad8673d475ed00208610f03745d237c3a9d9e30409ae72c6a80329bc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Static analysis revealed it functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites. These links likely serve as a distribution mechanism for phishing or malware, potentially exploiting vulnerabilities in PDF viewers.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce394ec4b1b---73689860401.pdf
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6e628a423d---lonanutemiso.pdf
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607b689a43896---saxajezudugu.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/e12a5142159d26c168669ba58bce03f4/zopipirof.pdf
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/787e975cd1b8d7ddc844d1e159341ea0/kapowegepuresepejep.pdf
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160794e8e1a876---rutaja.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/j7a31qpe1optd1iij4sb5rs294/44132987837.pdf
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5cefc147cf---karulogukewibu.pdf
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ac3799212d03322fc9ae78f1e935de6f/75962762765.pdf
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160849869dc2d4---69770240039.pdf
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/bpr1hcebn13m01rulni8l3fd6c/rosemebu.pdf
    • https://malashealthcare.com/userfiles/files/febenopitojajibejaf.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/1q5p69gf0srjuh85d0orqlv2h5/97110822886.pdf
    • https://clearpatth.com/userfiles/file/kinuduxewirowenereruvut.pdf
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd90e587a3d---luvujar.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/a833c1e3798a6f8cfa24cf4b46a4483b/93626155932.pdf
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606dbddfdc1b7---gedafonejiji.pdf
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ceecc13c5d---65001205476.pdf
    • http://iglozawiercie.pl/zdjecia/file/xewoga.pdf
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/16083db752f268---sukokikizal.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160869f8e8a6e8.pdf
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6d57d8f221---86203797369.pdf
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/pvnqcimpls03on8884a8n2nlnr/punovagibezukavusatezo.pdf
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/64d1fa63850e72176c272619664a07df/82175068071.pdf
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607166620b9ae---66279198555.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=quinn%27s+blooms+%26+greenery
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ded0.bin
5251ae9db1c2c483cc2796ae6f6529827a7a244e3920b3389c5030e26f7ffbb8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDED0 10112 bytes
font_01_sfnt_off0000f562.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF562 16792 bytes
font_02_sfnt_off00010d74.bin
1cdef6248c5a4b0f9b0fdd181d3a0deb4c75bf819de44f1a4b2918cbc21cc12d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D74 18116 bytes

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