Malicious PDF — malware analysis report

Static analysis result for SHA-256 d56fb6cf318e2245…

MALICIOUS

PDF

99.4 KB Created: 2021-07-07 21:11:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3c5472ec17ebf2483f68f00041a52f5c SHA-1: 66598536c01916da52f2bea6c1407634d6c2c715 SHA-256: d56fb6cf318e2245bc9bb22882283a50ef0c367a7df4db51b29b3416e263b8a6
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous links pointing to compromised WordPress sites, which in turn host other PDF files. The presence of PDF_RANDOM_URL_LINK and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a deliberate attempt to obscure the final destination and leverage potentially untrusted hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

Heuristics 7

  • 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 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 https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/9f5e574a1e3048fab39fa80b40b9c105/10962170509.pdf
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d67f14c774f---12366628120.pdf
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c58b21d2232---polokujeseluboxurer.pdf
    • http://pvhs1967.com/clients/a/aa/aa78cb05297cd93d8a9ab6bd1eb8a3c4/File/lufirawewotazar.pdf
    • http://sdtrafficticketlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/6610881137.pdf
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/ecff54eae26cf05d4c2d376c15f8e475/wuziwuguvowepupifebiv.pdf
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/62e75j7krs7lfofqra2mtdombu/fodonisukuzusawarad.pdf
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16076496e96c71---2147073923.pdf
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/1mul2j7kspshcus0cpi3k6f7j9/xoxojexowigix.pdf
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/def885a08ac3059d434d52224f7d43c5/xerokegubiwam.pdf
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c1bfa32313d---jeline.pdf
    • http://aquamedia.cn/ckfinder/userfiles/files/69152719393.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/tgkllmhdaqfv7vifgsrtf194a2/gokoremutejamemumofabi.pdf
    • http://reklama-kemerovo.ru/files/files/36760727200.pdf
    • http://zlato-invest.cz/upload/files/nuwomuzaxel.pdf
    • http://elementsgogreen.com/userfiles/file/zezunomajixaxuna.pdf
    • https://burgas-remonti.com/userfiles/file/dinepuxulet.pdf
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607517f6da9a9---tugirali.pdf
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/e7u29ijdr3ooad0k08v4hbvtki/43257398780.pdf
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/q1764p9n340omqd2o8br5v7lsj/latokiz.pdf
    • http://brenno-tojestto.pl/userfiles/file/vopawez.pdf
    • http://amandamaitland.com/images/file/25515893857.pdf
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/ca27a2862d5c91a45e30317dfb0b33e9/vaxuzaruvogumu.pdf
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d12b226442---fuzobivopujinivonewiku.pdf
    • https://tavio.ru/files/file/82347849094.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=hollywood+drive+in+golf+trivia+answers
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001211c.bin
720a73092c41b247a5a78a4b7bd259fdc6a05dc3e9f4d3a7e2f72c8ad46fd58e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1211C 10788 bytes
font_01_sfnt_off000139e3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x139E3 16792 bytes
font_02_sfnt_off000151f5.bin
5a42d1e38f610cb9d3cb9bb1be60a94b2db112461860a7f6288a8a000ef981f6
pdf-font-stream PDF embedded font (sfnt) at offset 0x151F5 17860 bytes