Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a6210bba4dac10a…

MALICIOUS

PDF

88.5 KB Created: 2021-06-26 03:01:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: baf4f3746db0358f3ba897b2a2230a12 SHA-1: 311ea04f0368e692b240cd16e799d99bfb052f73 SHA-256: 5a6210bba4dac10a721c86c7cb0a54cf091d871deb12314ea5f56f476dc04b72
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as containing a link farm hosted on compromised CMS uploads. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The presence of numerous URLs pointing to potentially compromised sites suggests an attempt to lure users to malicious or phishing content.

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://nnkcreations.com/userfiles/file/14082739799.pdf In PDF document text
    • https://arte-salon.ru/upload_picture/25663569990.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/fc1tn2ehlqh8j0qbuf8tdlvuen/28939016534.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160888dbe9ba89---widagozosu.pdfIn PDF document text
    • http://df-foundry.net/d/files/tupiwi.pdfIn PDF document text
    • http://mujuerp.com/uploads/ckeditor/files/20210604174443.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/2517c781bf34c364bc8fed60c111b0da/22365889651.pdfIn PDF document text
    • http://flooroverstock.com/admin/userfiles/file/nufiremegafilojojoxikux.pdfIn PDF document text
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/6bc172129823bfa693d220735a557514/96651801357.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/v5l4e9hlpi8dq8tmitf1a0t8qe/jojiver.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f5625c86a---sejefarif.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/57db67d3101da96a620d7116aa867a38/vaxoxelezanilagixiloxula.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/ts9vvip7hfktc7gvgg7dt12s74/pevezevuwovuwev.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/aa2f27691a9cb148679095517b2668d3/disuwomodamofawivukij.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f519e4b298---67328812366.pdfIn PDF document text
    • http://gd-weimi.com/upfolder/e/files/20210528174337.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/47320270377.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160768c496216c---saropavusatimomotiful.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/257d83db0ab8e06ec49ec6cb42bdd635/lapolejixerukujedatome.pdfIn PDF document text
    • http://bud-drog.pl/userfiles/file/17520180529.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/664f2ca6cfa6331247b88584a9ac2f86/82661189360.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/7e8bf48024f8d798f9a769c85cb2d950/94458368675.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d51ecd4ec7---59227087148.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/c6ebfc65709466bdef8b90300110a4c9/wisibikazanej.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/82705970658.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=fences+play+pdf+august+wilsonPDF 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_off0000f476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF476 10972 bytes
SHA-256: c0177d0dda8b874625721a5a1a12709947016289d70cc834554f1c85f4ff22bc
font_01_sfnt_off00010df1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12603 17188 bytes
SHA-256: 97ee218341688b461a361050ee5ff932f3e13bc247ee0f30ccefa84e08501108