Malicious PDF — malware analysis report

Static analysis result for SHA-256 e606f5f20a461a54…

MALICIOUS

PDF

78.7 KB Created: 2021-07-31 04:19:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cadd650bd3991eca73f645f9e4d493b8 SHA-1: a20458e9f65ba592bc64a848fdbcd90c226bc17e SHA-256: e606f5f20a461a54d22f16d9e0712bc831ef0c4b0ec6e1e1cdc47b6603c5304f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by multiple heuristics and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of links, many pointing to compromised CMS upload directories, suggesting a link farm designed to distribute malicious content. While no scripts were explicitly extracted, the nature of the links and the ML classification indicate a high likelihood of the document attempting to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607aefef2a466---21050580423.pdf In PDF document text
    • https://sindicav.com.br/ckeditor/ckfinder/userfiles/files/68240963966.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074d1c31f74b---79720513694.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/96291045032.pdfIn PDF document text
    • http://dd-eng.com/files/files/97992688464.pdfIn PDF document text
    • http://densayhongngoai.com/uploads/userfiles/file/16104338816.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d0b20d00228---49914367002.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/tusivelevopixije.pdfIn PDF document text
    • http://iamsong.vn/uploads/files/11657261016.pdfIn PDF document text
    • http://camberwelltaxi.com/survey/userfiles/files/zekawirefefurupox.pdfIn PDF document text
    • https://ruiguoex.com/upfile/files/2021/07/19/31314283033.pdfIn PDF document text
    • https://lionkingbali.com/uploads/file/zomijawoguzomotixeru.pdfIn PDF document text
    • http://ritadas.in/userfiles/file/78210650193.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160bfbf6cbec63---99619803362.pdfIn PDF document text
    • https://promise-land.com/upload/file/winemutajumitofoxiw.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6e0caac6a2---pujuzodid.pdfIn PDF document text
    • https://fruzsiflame.hu/userfiles/file/79997992071.pdfIn PDF document text
    • https://www.explosivo.gr/wp-content/plugins/super-forms/uploads/php/files/72fbf44f5a4c125dd7e60e4abf79903f/bikezigodewilop.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/l3dd01v5ajktvl5ba77mss8o85/961518182.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/vutezowe.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a09b919a372---24568859978.pdfIn PDF document text
    • http://ourconn.com/userfiles/file/202107201033396545.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160926e48a9580---10256468040.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160752d7d922a9---jusomonawexebeko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=how+to+check+user+account+in+command+promptPDF 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_off0000d006.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD006 16368 bytes
SHA-256: c1ec814b71a583c69be5ba80c74fb46b8ea14bc38cee52b755eb8b6213fadadd
font_01_sfnt_off0000fa99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112B0 11000 bytes
SHA-256: 1936adf83ba35eef187c88228fe7a138c99cc05aa5205fc8d2613c837c6466dd

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