Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba8a60dff2c0cb2c…

MALICIOUS

PDF

152.9 KB Created: 2021-07-28 15:18:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 0b22533e1ab09546b60a6f3ac7028b9f SHA-1: 9b0cfe56ce2ff88dbfc64cc90d4a5ca9efc9db2e SHA-256: ba8a60dff2c0cb2cf6af9a24af4179f4bd8f762fea6902f4849bff3753d64544
172 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating it is a link farm, with some links pointing to compromised CMS uploads. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The document body, though obfuscated, combined with the 'Urgency / deadline lure' and 'Visual download / call-to-action button lure' heuristics, indicates a social engineering attempt to trick the user into clicking a malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

Heuristics 8

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.blueoak.fr/image/file/86670882309.pdf In PDF document text
    • http://biswasi.com/userfiles/files/81368844837.pdfIn PDF document text
    • http://textingrights.com/userfiles/files/tapivavoviregapufoxolumuf.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/f9qtpe37bla01fotial6issv46/lubusujaxuze.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160feacbf38465---13270702121.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/palabekabajarimodepidora.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f5f4d59bc54---15999191408.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/xasagali.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/64kdslq4qdjqq6oj05qddsnteg/6105365404.pdfIn PDF document text
    • http://mldinsaat.com/image/files/21852379164.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/baleresalam.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/jgmrg56re98kn75hputrs7ldi8/83788538732.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/j0elep7c98dvbkcd26gv53g7ji/luses.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082d826e07b4---luwoponapadabenu.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/7fb06ac7a2016a5a6eafa3e67bc24da2/xuken.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/javosifuledozajanagomumu.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/bakomalababanuvuduk.pdfIn PDF document text
    • https://bajrahrs.com/userfiles/file/79622214739.pdfIn PDF document text
    • https://deepankarbasu.com/FCKeditor/file/86969595847.pdfIn PDF document text
    • http://hotstamping.pl/files/file/wetivitelilovuranizapagi.pdfIn PDF document text
    • http://sistarelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wipesuwerivesonuwat.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202106081952.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/51697599613.pdfIn PDF document text
    • https://trungtamgiasuhcmmq.com/uplaod/quangtri/files/fogir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=wilkes+fluid+mechanics+for+chemical+engineers+solution+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_007_off0002136b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2136B 22060 bytes
SHA-256: 298804e3ce5a6ba5495b05c508f99ca6369264ff30d9e529896fd493bbaa6c59
font_00_sfnt_off0001c951.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C951 18968 bytes
SHA-256: 9846c4759787b9acd989327a801b2664b485562481c20894af55291aca18b371
font_01_sfnt_off0001fb5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FB5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00023a2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23A2E 11108 bytes
SHA-256: b50c3dc81d63c6a09259ba719fbc435afa9554d9fda019aba89f5045c253360d

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