Malicious PDF — malware analysis report

Static analysis result for SHA-256 2de5e81832cd4280…

MALICIOUS

PDF

82.5 KB Created: 2021-09-03 06:35:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a55130a65cb9308949df8422810e7c38 SHA-1: 2660ace705a1564ecb8d4d1a2ee4ba6593170179 SHA-256: 2de5e81832cd4280a9ded67dcfa766c5fe30c5b1f3f6b59f7b525e5002371e03
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by multiple heuristics as a link farm hosted on compromised CMS uploads, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the nature of link farms in PDFs often involves JavaScript to facilitate redirection, hence T1059.007 is included. The primary attack vector is likely Spearphishing Attachment (T1566.001).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5a3f3bac4b---42633667028.pdf In PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/3u0e3d89joopfc6f6nm6j87fa0/marorinunoz.pdfIn PDF document text
    • http://beytarimcilik.com/admin/editor_resim/file/repefobazunagaxipet.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160be86597cfbe---godorolexojezolonibu.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/45a63949e162f66081b407aa3a8889b5/23405885415.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077035ec34b3---metoludoravafetisatader.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085d72be41df---42053910415.pdfIn PDF document text
    • http://bayihoki99.com/contents//files/bupofajaxorivuwedalo.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160bec43493487---medumujazerepusugizup.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/8135f1ae9471a6116397ac7912f16a2a/31710463057.pdfIn PDF document text
    • http://ventilatoryzlin.cz/images/file/pedezegatevotuwusizar.pdfIn PDF document text
    • http://gitimohammadilakhimpur.org/ckfinder/userfiles/files/sivotelegogesugadabiru.pdfIn PDF document text
    • https://lajovisena.com/gallery/file/81929764212.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/bs65ed3f7r6ntvsbbth0rerurc/zukavenar.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc35ed1483---7908487420.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160948040f2585---93883625159.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/9fa3de138a73c5510aba59bc408ca0f8/31048743810.pdfIn PDF document text
    • https://heyratacademy.ir/file/jukabamejoletewuvefesevu.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/c8970e734ab43d6bcb3727954958b773/telemovapekifarovebu.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/xurekegiju.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606faece5fe70---97863496887.pdfIn PDF document text
    • https://elitstroycraft.ru/source/file/15262865503.pdfIn PDF document text
    • https://dm288.rs/slicice/file/37419413592.pdfIn PDF document text
    • https://ideylia.fr/uploads/file/62110117279.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=civics+class+9+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_off0000de24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE24 10324 bytes
SHA-256: 0ce99ec992bc40b64c820e42c0e9eb7c35af15fd5959df6c8bd53244092162d7
font_01_sfnt_off0000f595.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF595 18052 bytes
SHA-256: d87c9d0c957fad279217ac8c5e8a4f8bf17b4a72ed5a9def45de285828ca8a49
font_02_sfnt_off00012415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12415 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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