Malicious PDF — malware analysis report

Static analysis result for SHA-256 5124d1ab52524d4e…

MALICIOUS

PDF

82.0 KB Created: 2021-09-07 20:10:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1b7e65fc3db770a91f65322f7d917d4a SHA-1: e560ba3dc0d54cad30f907bccd61e9022186ddec SHA-256: 5124d1ab52524d4ec918a3b0ebd7e33b6aa93a12a338d6810be4884b7ce5aa78
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it likely serves as a phishing or malware distribution lure. The file functions as a link farm, containing numerous URLs pointing to external resources, some of which are hosted on compromised CMS upload directories. While no scripts were explicitly extracted, the presence of multiple external links and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggest an attempt to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://jackinthegym.com/uploads/files/202108230636436345.pdf In PDF document text
    • http://forglass.sk/userfiles/file/88911361958.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16082bdd85b4ec---poxowa.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0dfa03235---50048405557.pdfIn PDF document text
    • https://lajovisena.com/gallery/file/befevefopusapideniv.pdfIn PDF document text
    • https://bettyloupaints.com/userfiles/files/86917844220.pdfIn PDF document text
    • http://thanuyentea.com/ckfinder/userfiles/files/jeralapokagijisaw.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a19fc7a5555---24125206836.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/99625477710.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/mf2m2j01ss1a49angusuhtp642/5454674155.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/6tlecfc7rk0820f1j98j6j4j8b/nifojerivuwize.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/5bfa6e7ea54a56922f33071bf98e0321/dukeda.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/0139b2f5ee208805e7df76d04aabcd06/8143334111.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135cd70cb8ab---divuraridamowuk.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/bf5d35f531a3b2e62cdbe60652c10eb5/78443643372.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/8e54051ded012827a28785ae04fd10b7/36813062277.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/290genrlop63igiqpae2r8gdr7/jenalew.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/56403627841.pdfIn PDF document text
    • http://premiumcsp.com/uploads/files/kivozikab.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/93957977832.pdfIn PDF document text
    • https://dubigroup.com/admin/fckeditor/editor/filemanager/connectors/upload/file/14216724081.pdfIn PDF document text
    • http://caythuocnam.org/images/files/tisit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=organic+chemistry+reactions+chart+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_off0000d7d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D3 11160 bytes
SHA-256: 101643b454030a2a7f2e32b4ee86b9e9699d79cdace388efd20f77b36c2013e6
font_01_sfnt_off0000f19f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19F 18816 bytes
SHA-256: b4d1dc9353287d6ef3966e3123d0596e17aa6796cb0f1ae1544f64941186c1fb
font_02_sfnt_off000122cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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