Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c1cb4bd78abbe27…

MALICIOUS

PDF

84.4 KB Created: 2021-09-07 08:15:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 49480de43c03403969d61054478641b3 SHA-1: 2fd7be742932d8e98404c8c72f396bb4f0b12a0a SHA-256: 7c1cb4bd78abbe27e6a7416bce4e2b0ee7da96675a38bc1cbc983666d3d15951
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating it likely contains malicious content. The presence of numerous links to potentially compromised WordPress upload directories and disposable hosting suggests a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://gemculture.com/userfiles/file/14912615208.pdf In PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/10043ee128bebab57c2b21922c88aae5/noxenide.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/009f4926f8c02c4f0acfa56922e060b4/nafewuwesupade.pdfIn PDF document text
    • http://thehigh86.com/clients/13680/File/69718013119.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a278d7c114b---sijeza.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16093cd5227ddf---solujevozavaxorekuke.pdfIn PDF document text
    • http://zimmerei-possert.at/serekox.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160758c066382a---buropesedixalupixiva.pdfIn PDF document text
    • https://cincia.ro/ckfinder/userfiles/files/dibeninilopesozisumuzun.pdfIn PDF document text
    • http://harissarantis.com/userfiles/files/venogurodefuvojunor.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/d614c61985748f1699d18c37d9b8a1d6/28165405365.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160c66c689d995---muvesad.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/53235022155.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/plr7rvsablu6vup62jvh54hjg7/fegetusa.pdfIn PDF document text
    • https://piauiaqui.com/ckfinder/files/82233730768.pdfIn PDF document text
    • http://geniuschulatutor.com/userfiles/files/19910110052.pdfIn PDF document text
    • http://zvaracskaskola.eu/editor_uploads/system/files/2542968842.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/2021526121113095.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/1e9qtlm49pqjcabt0e2oeuarch/fenaxuxuxobuvowovi.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/77020993559.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084816733960---wirelopujoviviw.pdfIn PDF document text
    • https://gelblighting.com/userfiles/files/19227749279.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/zigilurizepexuzulurin.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134085ab6b07---wobamaminage.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=reading+comprehension+worksheets+for+kindergarten+2PDF 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_off0000e52c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE52C 17432 bytes
SHA-256: 167b536a359e500dbc2df155fc2344fbc9911e595c8772651209171a36f35919
font_01_sfnt_off00011249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11249 11364 bytes
SHA-256: ff735549a1c404395a87388573a28c8a2f73763f64c207acdc9424cc3fe1a2f7
font_02_sfnt_off00012cbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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