Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cb629820f801453…

MALICIOUS

PDF

97.0 KB Created: 2021-07-19 21:49:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c5467dcfeccc282a363cd04f53fda7ca SHA-1: f377bd6dbdd25740d05a43d709d942b175e03483 SHA-256: 1cb629820f801453165a645c24c335d68523c536d51dea7b7ef5d3aa1b10c6a6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It functions as a link farm, containing numerous URLs that point to various websites, including those hosted on compromised WordPress installations. The presence of a 'download button' heuristic suggests a lure to trick users into clicking these links, likely leading to phishing or malware downloads. No scripts were extracted, but the overall structure and URL findings indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9802

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.
  • 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://manninareunion2012.com/clients/0/03/03b30fdf9aaeeba733afadbef254ff7b/File/junomobosam.pdf In PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/45e2c61e44628f027a9a96cfcd2271af/92170665861.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/5lb0qt7q0n7i380gvq9rjhvuib/41058724395.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/7ef7fadced6e09e80d5790bc39cab630/11515086404.pdfIn PDF document text
    • http://stlukesmn.org/clients/17773/File/lolusesajuxagarejo.pdfIn PDF document text
    • https://easybuildapp.com/files/uploaded/files/89102010161.pdfIn PDF document text
    • https://study4student.com/cache/fck_files/file/dufetaxuwewujanapa.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/qf48ubu4usdgmqehpv0athao23/69827204241.pdfIn PDF document text
    • http://osc-pribor.ru/products_pictures/file/38089737358.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076c09c182c7---94951759234.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dbe70e0fa9---riraponofasutagej.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/b29edfd29ff5f3abedae46e5de3a1b90/nigemokaserujamelabugidak.pdfIn PDF document text
    • http://evola.it/userfiles/files/36261615165.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/84734407167.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/5067779de0d04a78851a75c26a9e59a7/tejuwetobuxop.pdfIn PDF document text
    • http://bannails.com/fckeditor_userfiles/file/1638688828.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/8c077b9a54b2b7a9c8ca08e0a1aedd30/96260683535.pdfIn PDF document text
    • https://freshchannels.com/home/sites/freshchannels/public_html/ckfinder/userfiles/files/47717202856.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/23950ba23600dfcf2cd4fe7b6d5e7c41/pisemimirariburemokap.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/viwak.pdfIn PDF document text
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/74156383425.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/semuwubibinowuv.pdfIn PDF document text
    • http://teacherandtraining.com/coj_u/KK/userfiles/files/gakojomate.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607a38869d909---96147740494.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=ps4+android+apk+gloudPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f39e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010bab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BAB 1848 bytes
SHA-256: faf8f90ade149b16136039acdfdc95e0d5546668f45187cd3bec1535a69d9aec
font_02_sfnt_off00011437.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11437 10608 bytes
SHA-256: 35e0f64c4e766e453c2d88c21a3807815e61442fae88a6f0890a5172e22d83fa
font_03_sfnt_off00012c4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C4B 16164 bytes
SHA-256: fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467
font_04_sfnt_off000141bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141BD 19968 bytes
SHA-256: 0366f1c2a06de765c721f4e7d030ebd4919327e8e36966d28d4a22f47de4a092

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