Malicious PDF — malware analysis report

Static analysis result for SHA-256 017c1b435827f62e…

MALICIOUS

PDF

84.1 KB Created: 2021-09-05 12:31:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 30df5ad2312a94aa201a58fb316f6b6a SHA-1: deb83e8cf8b6eed6cacab46b76894c82fa0f85c4 SHA-256: 017c1b435827f62ee8002a54a4fa6b61659a353322a2293b25220068523dfde5
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or conduct phishing. The presence of multiple external URIs and link farm heuristics indicates an attempt to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4071085a6---97468244381.pdf In PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/7c188789976e009670a1a816a3c87e48/palimafu.pdfIn PDF document text
    • http://anm-av.de/uploads/files/vofokaduwimixa.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/51949150305.pdfIn PDF document text
    • http://chicohigh1987.com/clients/47015/File/wowelili.pdfIn PDF document text
    • http://gps-ambroisie.com/ressource/site-image/files/8113256643.pdfIn PDF document text
    • http://zopos.zohukum.com/ckfinder/userfiles/files/60733226029.pdfIn PDF document text
    • https://chpcentre.com/files/file/fikuxatileninesagageguf.pdfIn PDF document text
    • http://sicilalluminio.it/userfiles/files/25424978852.pdfIn PDF document text
    • http://happypalettebnb.com/CKEdit/upload/files/99909128019.pdfIn PDF document text
    • http://ithalattagarantibelgesi.com/resimlerfiles/wotamukemituxufizuk.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3d78bc2932---dupedaxeg.pdfIn PDF document text
    • http://profm.hu/files/file/fijabumokamafu.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ab00064596a---nazekofosenizetupajil.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/u7er3of0rt7uqvk2fbk3u47mua/viriduzadurulegajel.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/ee38752daea416f66fc546be2b3c4b67/kuvegotajifop.pdfIn PDF document text
    • http://bvsaigonbinhduong.vn/uploads/files/novujarisodowojotemomun.pdfIn PDF document text
    • http://expertcomptablecourreges.fr/michel_courreges/userfiles/file/30640953485.pdfIn PDF document text
    • http://hzdsbg.com/uploadfile/1622269102.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f4cb300d9---riperubekamewudadino.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/4cc170b9f15938de01bd4919a1c71708/gopuwutijifiwefasun.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/f1f7e701809fb9b825c113d98307577d/63703818109.pdfIn PDF document text
    • https://vokalensemble-vocembalo.ch/userfiles/file/74251116299.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160784b83254b0---vetowopokexitelexa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=hatha+yoga+pradipika+english+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_off0000df7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF7C 19396 bytes
SHA-256: 69e5433b35083fbcb46eb685714096bb15ec4f5716768592fb04cc2e86aaa928
font_01_sfnt_off000111ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111AC 10972 bytes
SHA-256: 3411f00b86068300b3f77d52bdd6733632b5e5697e2eafd70ad86bf3d1ddf077
font_02_sfnt_off00012ae3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1