Malicious PDF — malware analysis report

Static analysis result for SHA-256 75c81a8477388f9c…

MALICIOUS

PDF

85.4 KB Created: 2021-07-07 18:13:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b990c09f275170b0a76b536598aa9a5f SHA-1: 6d49d90e3d11c80b1543e74bdd3f1a81a47694dc SHA-256: 75c81a8477388f9c58b4893dc905965351105a77f2c3660ac5797bf088eac572
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress sites and acting as a link farm. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its true purpose, which is likely to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 https://bauarch.bg/files/xazevagamoxo.pdf In PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609b269e4a040---kubibimunu.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/selepimunibupapukazuz.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608484266ec9e---58682681533.pdfIn PDF document text
    • https://bangvetthuong.com/luutru/files/jirudevedemaxuzusud.pdfIn PDF document text
    • https://sudhirsachdevaclasses.com/ci/userfiles/files/78760970748.pdfIn PDF document text
    • http://vstarmp.cn/upload/files/20210614_205806.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160720710bc3eb---tapufok.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160868f91e6d30---jasekixejo.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16084aa84e1b35---91082044893.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/0q2r8oi10tmp3vod6nffitudnk/85219544048.pdfIn PDF document text
    • http://minhvuongthuphap.com/upload/ck/files/tepejulawiferope.pdfIn PDF document text
    • https://ariaparvaz.com/basefile/ariaparvazcom/files/finodiluvoxopebadepepidi.pdfIn PDF document text
    • http://crocepadrekolbe.it/userfiles/files/rotagawoxuxixitalo.pdfIn PDF document text
    • http://piazzademarini3ge.com/userfiles/files/94721339107.pdfIn PDF document text
    • http://fjzy18.com/image/uload/files/lokunatepobawuvenu.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/libmtbf9d7goprl6n09h416f15/5490788895.pdfIn PDF document text
    • https://pablohernandes.com/wp-content/plugins/super-forms/uploads/php/files/127366a0411e51eb62f9a63099224af7/99702814013.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ac002b3a64e---57204084403.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609492eaa6171---gedepulumifajirib.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/dkikhvbi6emi0ucej2666d623n/sumumexibafefuwolavizutix.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/44016307775.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=signs+that+your+body+is+dehydratedPDF 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_off0000ed4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010562.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10562 10908 bytes
SHA-256: 8cf79b88a989b3e220ae6b0c324c01f2b6ff9ad0bf2bbf4ed8a3f1e8f8962a4c
font_02_sfnt_off00011e5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E5F 16264 bytes
SHA-256: 96b84e0f8011d92f81034c3749459e12e7be20af36de8e448d3d4d7bec1329aa

Open this report in the interactive analyzer, or submit your own file for analysis.