Malicious PDF — malware analysis report

Static analysis result for SHA-256 3251ae2d7c11e85e…

MALICIOUS

PDF

89.9 KB Created: 2021-07-05 19:15:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 31efab31b2f403f8a1061d5e3243f1ac SHA-1: 6a9b8d955e0fadbb9bf6036d5093aa746dc06202 SHA-256: 3251ae2d7c11e85e5f05347bc87d782aa7c5f3f8e4d920cfd23b1eb7d7aee29c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that point to compromised CMS uploads and disposable hosting, likely to lure users into phishing scams or download further malware. No scripts were extracted, but the PDF structure and numerous external links suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://drafthe.ru/uplcv?utm_term=stations+of+the+cross+prayer PDF link annotation
    • http://elyriacatholic1970.com/clients/7/79/79c6984f8945646ae1b55d50a6b4dbab/File/30784782863.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c091404b3b2---zifebujafa.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/32e1f856c9df7b4cdbe0bc52d87db7a1/dulubekatakikuposi.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160767bfb6e588---17598618470.pdfIn PDF document text
    • https://htlexpress.com/ckfinder/userfiles/files/gorivuvo.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/972blct2s2jgd37kms6pebrp5d/pusojijowafebavomutamuf.pdfIn PDF document text
    • http://cepsagibyachtfuels.com/images/photos/tuxogoxawogib.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b577636239f---3720794878.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/sadadifudeti.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/b8a98f80c915b99458c298d4e42bd3cc/1526003747.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/tivexozatiketafag.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160782b5bea06a---7147028410.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16094833c8ab0f---81519922093.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608631eb24edf---16400246513.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/60e2e3df601dc86c888b5086ae866b3d/1460708274.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/v5n12fl2852a1mu6fptovj8eo6/81817043068.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc01108ef4---41862677790.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/a345333a74e0e51f55256ce026d5be0a/88194034922.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1607902f2d631d---78691971208.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/17746760838.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/71898035684.pdfIn PDF document text
    • http://ural-resyrs.ru/data/file/34680956819.pdfIn PDF document text
    • http://krzysztofmalec.pl/gfx/fck/file/39308374352.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/42507173599.pdfIn PDF document text
    • 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_off0000fb82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011399.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11399 10720 bytes
SHA-256: 5b1580b58ddfd501dde29ad6999e4e0ff4e25fe9825860ad740985fe8a252d98
font_02_sfnt_off00012c27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C27 17928 bytes
SHA-256: 1a37765a4c723a2a5d1190a93028439319dc9dc9781233262e76b8a8fb016b4d