Malicious PDF — malware analysis report

Static analysis result for SHA-256 18f74bacdf68574c…

MALICIOUS

PDF

91.2 KB Created: 2021-09-03 10:31:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 694c38dee59cbde2ca6fff2d58eb334c SHA-1: 6c2d6508ed04615ae94122314d3378a59bb23230 SHA-256: 18f74bacdf68574cdf304a124d718da3d5a96ba951cc070fdedade37acb8e249
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to redirect users to malicious sites. The embedded URLs, while some are marked benign, are part of a larger pattern of link distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e14650f32eb---59741854353.pdf In PDF document text
    • http://giadinhlaurenso.org/upload/files/xulemewu.pdfIn PDF document text
    • http://pelesiuvalymas.lt/i/File/15724973127.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070a465d3849---43398552128.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606ea2b610af9---50349782120.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/665983c6087613f23f17c8affb142497/22872911506.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16102596a93f3b---67237798068.pdfIn PDF document text
    • https://abicecream.ru/ckfinder/userfiles/files/ruxotu.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/18824407366.pdfIn PDF document text
    • http://www.videobezopasnost.ru/ckfinder/userfiles/files/12666431792.pdfIn PDF document text
    • http://atonoserver.com/userfiles/file/40551676737.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca6f3ab769---kavimuja.pdfIn PDF document text
    • http://thefarmatarapahoecounty.com/userimages/2917057217.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/j4js369ovbiov90j1er1u7nb32/89820271755.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/e1rlbg6sa4pv8e0m3fffb525r5/buwodafateki.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/52996847985.pdfIn PDF document text
    • http://trunghungplastic.com/luutru/files/miwilisedinuxogokibu.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16097900da77ac---rojufofasip.pdfIn PDF document text
    • http://gusanhightec.com/userData/board/file/59491933089.pdfIn PDF document text
    • https://creteservices.com/FCKeditor/userimages/file/56189664983.pdfIn PDF document text
    • http://artechq8.com/beta/uploads/files/98203253581.pdfIn PDF document text
    • http://vtaky.sk/media/file/36132965594.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/d8f3ac0cc8c271d3fc69834c19d83613/muxetujup.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/gapumovugubufunikilitul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=sermon+outlines+for+youth+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_off0000ff36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF36 18228 bytes
SHA-256: f29184e0e896e7c768635e2bf79dfe927f75c06bba4ed33cc1ec46874ac5eacd
font_01_sfnt_off00012e7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E7F 10892 bytes
SHA-256: ff024a536dc5c3d7f934c4a4e957cfe921393f85ae7b36aa1e4344faca590a95
font_02_sfnt_off0001477d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1477D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1