Malicious PDF — malware analysis report

Static analysis result for SHA-256 32d410023e04422f…

MALICIOUS

PDF

82.8 KB Created: 2021-09-04 01:23:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f0bcd755416ded50b33dcec310595a86 SHA-1: a415f91307b8b17a4b9ab286b7d6a359b9ba31c4 SHA-256: 32d410023e04422fc773b262a7dada4b3171dc120aac47e380cfa218b50f3c00
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to potentially compromised WordPress uploads and disposable hosting domains, likely to distribute further malware. The presence of numerous external URIs, many flagged as part of a link farm on disposable hosting, strongly suggests a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://rexant.by/upload/editor/files/62830703568.pdf In PDF document text
    • http://dooroc.com/tk/upload/file/fekadunasaf.pdfIn PDF document text
    • http://hzkontejnery.cz/ckfinder/userfiles/files/fogurepajixo.pdfIn PDF document text
    • http://td-mg.ru/uploads/files/40328371288.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609863347bbac---51130492233.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096a2364c6b4---72305518441.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/zitobavid.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/v2jp26om7brq6sgo454a0tp3c0/gaseleromixojatesadir.pdfIn PDF document text
    • http://sshs61.com/clients/6/60/60e739d5a8cf4a6710e4f064fd99417d/File/18599430108.pdfIn PDF document text
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/8hq8ddg8vvmn3nctd9uue292qd/xudezutigewi.pdfIn PDF document text
    • http://landonintergroup.com/ckfinder/userfiles/files/wepibejin.pdfIn PDF document text
    • http://inspirationforexcellence.com/clients/66491/File/16587458538.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/xeriwovoxuzonutidixev.pdfIn PDF document text
    • http://veterky.ru/ckfinder/userfiles/files/92562074585.pdfIn PDF document text
    • https://ilcaminodaugo.it/file/70990415985.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161294eb368650---dikunidipewamenasol.pdfIn PDF document text
    • http://tsrmmessina.it/userfiles/files/72887175866.pdfIn PDF document text
    • https://harrisitalia.it/uploads/file/kesexifanari.pdfIn PDF document text
    • http://fluorescent-training.com/file/wigolenevenugugoli.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a150e8376e4.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/27846156147.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/3l37g612dgtq7ev8k8ecqgs9uv/gepanapigujo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=audio+technica+lp120+service+manualPDF 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_off0000dadc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDADC 11220 bytes
SHA-256: 8428e5f0dbb5096be53d283c25b21d6cc75ce7aa684768b26cb11fa64d0836a0
font_01_sfnt_off0000f50d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF50D 18464 bytes
SHA-256: 402139446fd4c2d98a670653e1dcf834426f5959276bf7feee753fb25d49dbd0
font_02_sfnt_off0001252a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1252A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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