Malicious PDF — malware analysis report

Static analysis result for SHA-256 0735e9c6e7a9c67d…

MALICIOUS

PDF

91.5 KB Created: 2021-06-26 23:51:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 3e18b63acb310c6b9570c307cd4ab420 SHA-1: 52f07e333ee302b5fc1998e3b02efdc79db5680d SHA-256: 0735e9c6e7a9c67db7b7e67fe4442461804c06bee7e4ce50109042e09b90b9cf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated maliciousness. Several heuristics identified the document as a link farm pointing to compromised WordPress upload storage, suggesting an attempt to host malicious files or redirect users. While no scripts were explicitly extracted, the nature of the URLs and the detection suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd5ca2b8aa---77509902968.pdf In PDF document text
    • http://kaupa.cz/userfiles/file/7562985185.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/44a0b232a6aa2a6b06c8c0e72c4f0a41/xemurezodasini.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/23f8a61c0e8bc9879419d1c481cc6939/67950164933.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c362e606871---26619867430.pdfIn PDF document text
    • http://lapawan15.com/shop/fck_file/file/89936342988.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b2ffe5de788---piriput.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/96tcp1rk3h52002p8vrs091dt3/97019072082.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/v3dibup9aa9777jmht0lmo412b/27723164980.pdfIn PDF document text
    • http://charivne.info/images/file/56302144495.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087a1ec8fae5---284473220.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/6d7c500e7617782cc39fa81116953455/jatok.pdfIn PDF document text
    • https://jordanadams.com/ckfinder/userfiles/files/32469262717.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607243f353f25---22246416924.pdfIn PDF document text
    • http://hk-dcc.com/wp-content/plugins/super-forms/uploads/php/files/rn5u7d61l8ea96ivhu226fh17g/gexupa.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4b26c3f34---40016495976.pdfIn PDF document text
    • http://jarosi.hu/files/file/razasogamopufedowe.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/u1pc1is9peok0k5k8q6u33nge3/79529877978.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/16080600e267c9---81848608091.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608e382f953e5---titipomukanusuwev.pdfIn PDF document text
    • https://kristinanamaste.eu/files/44317064780.pdfIn PDF document text
    • http://birkhoffhi.com/userfiles/files/58661803198.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eedca041a0---fuwulitodimanorebusiparan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=anne+askew+the+tudorsPDF 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_off000105ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011dc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC0 16888 bytes
SHA-256: 208957ef1214251cb4842ccb3cae40ea2418108cb203bb7ba7d328cc381c1585
font_02_sfnt_off00014950.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14950 10464 bytes
SHA-256: 0d74dd8b47bbd3bd5bd9a24e03f04592b129139d2514b06989de8f27925afac4

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