Malicious PDF — malware analysis report

Static analysis result for SHA-256 83843e03457578e8…

MALICIOUS

PDF

82.7 KB Created: 2021-09-01 19:17:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 969392d21c40a54c51e7326e71db24a4 SHA-1: fa4197f53f0ef3303982d1103a6abb83a241f867 SHA-256: 83843e03457578e872f257a058ea084e8672545beb825735efcb52a2dc49380c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to distribute malware or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent. The presence of multiple URLs on potentially compromised CMS platforms points towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 6

  • 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.
  • 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.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160ae126360f8d---22146091677.pdf In PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/526361bfd066371acdba4ca5f1b26917/bowusitotorededudebijejij.pdfIn PDF document text
    • http://bettaletroom.com/file_media/file_image/file/54403464899.pdfIn PDF document text
    • http://zonweringbelgie.com/ckfinder/userfiles/files/kamub.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/zenogulijizoleli.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070d2d997200---zojumis.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/b172e110ebd9012e8797e466205f302d/voxonovemakoku.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/kae39s5silhelkttp836p2iaus/pipemelalute.pdfIn PDF document text
    • http://cissi.it/userfiles/files/zapuguxamatimupulifimise.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/d2untuocn0gast23csvt3rvbhb/73417095770.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/08/01/file/20210801_060119_143.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/turikosabar.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/i2tfq510k7an2hndj7bo05n565/jizegutexetujepinidobonuw.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/16124456e79438---64265376085.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/ckfinder/userfiles/files/22923847208.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1d64266a4---vowuredaboxapopibati.pdfIn PDF document text
    • https://sleepthai.com/piceditor/file/mukubezuvekuganonasoman.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b994255ecbb---41771654480.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/e540744adb18625ac632062dcd1b81d2/37633935876.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/c45b0cdd4fc46a71f9e255d2c364db04/mokuvedopojab.pdfIn PDF document text
    • https://zweefvlieg.net/userfiles/file/nasebazedabosaxuvunute.pdfIn PDF document text
    • https://bwawarszawa.pl/upload/file/xepuwafasod.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/robalipakizanuzedufofu.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/3a6a026982ef29e85b58f608ca5cae50/2764728585.pdfIn PDF document text
    • http://zhfangyuan.com/uploadfiles/files/makozavokugotatunevedime.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f020d08b7---powiduziladulijopitara.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/5bfea4900aceda15373416423a1423a1/wivopasilu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=kyphosis+meaning+in+englishPDF 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_off0000ddf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF9 10604 bytes
SHA-256: 5cfed32d8fd5ad861a129892c0417b07e0195d92b353f28d815cbfaa58276e84
font_01_sfnt_off0000f600.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF600 18456 bytes
SHA-256: 1615e529d0b0e67d87141a3b4e2bea963b9aedc5f363fe22efae4094cd789316
font_02_sfnt_off0001265f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1265F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1