Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bb5a5a8247e387b…

MALICIOUS

PDF

81.4 KB Created: 2021-09-03 20:54:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0b1f5804ea01a691ff8b9a11e58e4977 SHA-1: 765ed51687fef54bef3c6f19aed56ddf310fa4a8 SHA-256: 6bb5a5a8247e387b9762570555f11780118e4b6f99a02e27bb9bcc3c42b5dbc4
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious or phishing sites. The presence of these links and the overall structure strongly indicate a phishing or credential harvesting attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://catamma.ru/uplcv?utm_term=contagious+diseases+pdf PDF link annotation
    • http://richmore.kr/uploadfile/fckeditor/file/14595467756.pdfIn PDF document text
    • https://corianderedmonton.com/ckfinder/userfiles/files/paloponiluwigul.pdfIn PDF document text
    • http://vaughanreunion.com/clients/7/7c/7cfe0b8ff6d5e3136a6575a9b258a09c/File/70385954593.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/mubevapuritugomojeneguv.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/33488352734.pdfIn PDF document text
    • https://triosms.com/userfiles/file/somuma.pdfIn PDF document text
    • http://amghanoi.com/images/ckeditor/files/zajaguzogemono.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce38ed22f5c---jovepabigo.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/giburovunuxoxolevomer.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/zexolidiferumopa.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cff77811c35---57852096499.pdfIn PDF document text
    • https://jairdefreitas.com/ckfinder/userfiles/files/xumibadoxagifajo.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/14e32dd2acdf5f8dba4508400e20a77f/vuxono.pdfIn PDF document text
    • https://ferropula.hr/files/60022882877.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/bepogebegapak.pdfIn PDF document text
    • http://losmarinoslanzarote.com/marinarubicon/admin/file/274303386.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/tufejabulif.pdfIn PDF document text
    • http://asianaccounting.com/admin/fckeditor/userfiles/file/vetur.pdfIn PDF document text
    • http://albertopizzetti.it/userfiles/files/29078773015.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/94573487213.pdfIn PDF document text
    • https://aplusadvance.com/naver_editor/data/file/11401654879.pdfIn PDF document text
    • http://ballmillfactory.com/d/files/tevumiruvedadibabalu.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4da467cff3---xafiruwavipuduzejetamowes.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f45e7d1498---35067671477.pdfIn PDF document text
    • 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_off0000da4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA4A 10656 bytes
SHA-256: 4811c783cda5c94c37577d754c50ab671882519614edf83bf6052dc22b84cd2a
font_01_sfnt_off0000f2ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AC 17396 bytes
SHA-256: 72f992ec185fa17d281afb6373027142076a3df60c63d908b47190bce935e793
font_02_sfnt_off00011fd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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