Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b3e0c08e129b838…

MALICIOUS

PDF

96.6 KB Created: 2021-07-24 02:13:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2793cda1954569bb438036ae32a901a6 SHA-1: b27585a5e24a284640b61a6b4c9298cd10fddcfb SHA-256: 5b3e0c08e129b838d9e9e30b43ec869c30ed85bcba15743443e66edcfa8a2f47
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links, many pointing to compromised CMS upload directories, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple PDF link farm heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/ca2487988390a3bc5bbfe0a7f0f26442/35065798875.pdf In PDF document text
    • http://www.ecostroyservis.ru/File/sopebar.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/noduli.pdfIn PDF document text
    • http://learningkey.org/userfiles/wawufapegojuduzos.pdfIn PDF document text
    • https://gencerenerji.com/resimler/files/21826716677.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fdd53cf0e0---68212123574.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a38020dd3f3---natakaduxuk.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/xenotuvejixisowedefopi.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/fatixarugalu.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/398f10a95422094694ccf70ba4746779/96897671047.pdfIn PDF document text
    • https://nmg.lv/img/uploads/files/vifopupuseg.pdfIn PDF document text
    • https://emprenderem.cl/files/duzemafapotesivola.pdfIn PDF document text
    • http://thepducphat.com/upload/files/31507667724.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd2a8854d6a---84710304505.pdfIn PDF document text
    • http://mmckno2010.zkosuchdol.info/files/38041487396.pdfIn PDF document text
    • http://mdc.ir/ckfinder/userfiles/files/83049967305.pdfIn PDF document text
    • https://dodatnojamstvo.com/userfiles/file/45292029417.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/b0869627cba99cd1eaa9d44dc06c5877/saberenizixidodugefunulo.pdfIn PDF document text
    • https://jxloanchien.com/style/postimage/file/74760971974.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/069d85950f897deab6615826f86ef3a1/mufiwamixik.pdfIn PDF document text
    • https://andana.us/files/files/72222369818.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609c934843892---80076111529.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/14qovl1cjnncjljar3k8gp3jed/jexidasetapavepujimo.pdfIn PDF document text
    • http://iehyun.com/editorupload/file/33382198068.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/b64bec64c2ea07437c8c2e2944304864/raparovelu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=dream+league+soccer+2020+kits+juventusPDF 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_off00010e59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E59 11204 bytes
SHA-256: 4ca91e41f1bce780bffe014319a676db62a730305da58671fa3c92325ed8001a
font_01_sfnt_off000128a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000140b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140B6 20072 bytes
SHA-256: 999fa07ce18eb49d72ee9dc2db8175b5ce6eee2f9a3c35315baca9f5ac0f4d47