Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f62269bfec5b0d4…

MALICIOUS

PDF

93.4 KB Created: 2021-07-01 01:05:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5f0334ce767fcad308e9fb4f5851adcf SHA-1: 69bf0658bfb965dbd89468b8261ba493c373f361 SHA-256: 5f62269bfec5b0d4512d0c9a2e1ac91412336f3a22e920a6c1953497a5cfdf95
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute phishing content or further malware. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d4ced9de18c---gativepubit.pdf In PDF document text
    • http://nawaress.com/webroot/js/ckfinder/userfiles/files/58344816375.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/0887be886fa08e3259a69f1cc144ec86/xowusotiga.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/f42d6fb1efd683d3ee94f55cd8dd12fa/2766114069.pdfIn PDF document text
    • http://lnshiyue.com/userfiles/file/20210615160433_1193074391.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b9471f0b6cd---rarimaxujafuzakovelofuk.pdfIn PDF document text
    • http://aimic.com/userfiles/file/ripemozukajutawabirin.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/jtq4utuek9s9mecold4m091ja1/darapize.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f0d65173cd---68794277971.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d9ff3fd79e9---voreza.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/0f6e7f07d9b011f91922e1b9a94773eb/mewawogen.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/050a757ae0fe86a6807285b50f7b2572/70232256583.pdfIn PDF document text
    • http://cropscipublisher.com/files/upfiles/file/lamibamoxi.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/mepumefuzaledos.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/21317979262.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/kuvekujuropi.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/d5c33281b1b5ce8d1420bd66186b7c0c/galap.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/23q8hfn0tqbi8p1an281csa7i5/kifopupena.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/ufosb7hf63hltvoounhc18n040/rezalamazomosaxum.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a1da46118b9---tanokowomu.pdfIn PDF document text
    • https://triptoboloyfoundation.org/editorsfiles/files/gazemaxedorujixajodip.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/74641267733.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/79263337427.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=barriers+to+effective+classroom+communication+pdfPDF 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_off00010a5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12274 11000 bytes
SHA-256: 983844d365eae33b43f88fc8311d82528b7177cf7032674ccaaa3ab3dc63667c
font_02_sfnt_off00013c0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C0C 16980 bytes
SHA-256: 0f1dbc5556f3b53fd66e6cb393b864f697c5e56fb9d9a0aabc27013c43fb2079

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