Malicious PDF — malware analysis report

Static analysis result for SHA-256 70fc3ab532d50f35…

MALICIOUS

PDF

88.2 KB Created: 2021-07-18 22:36:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 20d5d3d6f519cc480cbdc36dd7b3379b SHA-1: df6aa4b7f6c43f0b36732ab4a3d6bfc3bf6313bd SHA-256: 70fc3ab532d50f351d2f0e9fbe6d6b52ab6d60709886545b7fa456a966c4e5b1
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://local-atlas.ru/userfiles/files/mivorazafebuvigupopef.pdf In PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/723b87fb4629d8d4b7a681008e5e185a/xadijavajodavob.pdfIn PDF document text
    • http://broadmoor79.com/clients/864886/File/45061108227.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/wajomunimiwanibadomi.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160f26596f2968---mobawuresefumufuzemi.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d7e57d825aa---juvewevoso.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086917261ca5---2942308652.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/535ca51a4fcc6c9431bf02b4e03dbbbe/86835944575.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/64116962350.pdfIn PDF document text
    • http://chamdure.com/DATA/files/bipolujibuxem.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/1537764648609653ac1c351.pdfIn PDF document text
    • http://mariopresto.pl/userfiles/file/6074566743.pdfIn PDF document text
    • http://thamdinhgiadaiquang.com/img/files/98694337119.pdfIn PDF document text
    • http://duoctruongxuan.vn/userfiles/image/file/tojiwusidis.pdfIn PDF document text
    • https://francoisdaulte.com/ckfinder/userfiles/files/99576313554.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/p4pcjhqlr4ojmq0b1uf1q643pi/zedekikufopubevobuwitegi.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/b07becf479b3606801a4fcc7521aafb0/fuwafotedadawigidene.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/09034ae3b5403e1551a7772ce5800e64/70220359525.pdfIn PDF document text
    • http://studio-orlandini.com/userfiles/files/55617532193.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210506035007266.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/a3f8d7013d53b1af840976023c9d586e/vifip.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084ddd87a409---tozademaxada.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160940bcd98f46---49532164673.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a1b1c0477---14046830077.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/f4e8ebc51a3eaaefcc56aab2fd01d9f8/23934524117.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=the+name+of+the+wind+patrick+rothfuss+pdf+downloadPDF 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_off0000f16e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF16E 11124 bytes
SHA-256: 70d7208c645826829cf244974e4ccf4aee90612ff911464df109c686458d46bb
font_01_sfnt_off00010b3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B3C 17572 bytes
SHA-256: 7f3497846a70cd964292c3614d072b7fba932855faf689cb3673ab546954554a
font_02_sfnt_off0001394d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1394D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1