Malicious PDF — malware analysis report

Static analysis result for SHA-256 59c610b87483317e…

MALICIOUS

PDF

92.4 KB Created: 2021-06-27 21:48:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 532209a31534f84ef84c30080a489723 SHA-1: e395922055168d4e0bb8b44ab726eee338d00950 SHA-256: 59c610b87483317e8e3b5f3e9ecb753fdba025fea60123018f9496699c958f32
156 Risk Score

Malware Insights

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

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users. The PDF's structure and the presence of multiple links to potentially malicious content strongly suggest it's part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/at56s8eq11bh7lsc4fil4p0c9h/73478741241.pdf In PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1606d17549370c---36481692366.pdfIn PDF document text
    • http://liubeauty.com/luutru/files/vasiwukemajojes.pdfIn PDF document text
    • http://eurekaelearning.com/upload/news/file/50233800604.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/74ba37f422518b1bdfea050044a5a70d/10182348570.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/58889113097.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077898a654c8---37169141161.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/e70855979db9fa3828e86f7519f59f3c/bakejazorad.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/95612485537.pdfIn PDF document text
    • http://bluekeydigital.com/images/pic/file/14265710265.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/o8ujvtg9vo6pquc8pfkrhv8d91/18271895729.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/8629779335.pdfIn PDF document text
    • https://samyenngochoang.com/wp-content/plugins/super-forms/uploads/php/files/0mcrdjrmulslb8ui8i1v0ebmd9/61470973472.pdfIn PDF document text
    • http://joyear.com/ckfinder/userfiles/files/41070294904.pdfIn PDF document text
    • http://bidhichand.org/sahodyatarntaran/userfiles/file/79252319370.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/13f85d20873fb4fe5b9e555603a2db39/61960932309.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/67364360499.pdfIn PDF document text
    • https://www.erenang.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084aa7582440---balijafupijedizeb.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/jopebusu.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/514e5e7a0e35c1a8a5ab95f486a4b28a/fomedovaxadaguravuzode.pdfIn PDF document text
    • https://ambient-interier.cz/files/files/vawafevirugegase.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/3f10a8174b53f62dce368d5b70d94a23/girikizixidiwop.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c9347d000fa---43999531374.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/7bfa211f6b70da018fc381f22f92e62d/7709984740.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/56d5c292283463e74646013b85bc43df/kuporiremivoxotobe.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e94926644c---senudutedugazafi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=evening+prayers+before+bedPDF 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_off00010962.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10962 10832 bytes
SHA-256: 800a31424e6717457e7a306b5bf5d21a087ea184b5a3065840a8b70749f01725
font_01_sfnt_off00012213.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12213 16536 bytes
SHA-256: d1959aa207ac42a0180661bc16995a0705e58230888b1ee140882d04ce65d064
font_02_sfnt_off00014c4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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