Malicious PDF — malware analysis report

Static analysis result for SHA-256 4efa1c6c570e70b7…

MALICIOUS

PDF

84.3 KB Created: 2021-09-19 22:19:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f914a73a05c813b91c373da4d2c7ed07 SHA-1: abdf7039a6a0b94a54ea3f38e7fb076029693856 SHA-256: 4efa1c6c570e70b7ada55f6a260576e423469eb5e08a86c51ec786f473b2d1ab
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. 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 content. The presence of these links and the overall structure indicate an attempt to exploit users through deceptive redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://ohadalegistrocbarter.com/ckeditor/uploads/files/66841839624.pdf In PDF document text
    • http://sm300159.agchost.com/userfiles/files/wepolitelubiki.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/wuxifepokunurakovokafiga.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/19975129335.pdfIn PDF document text
    • http://radtel-sport.pl/userfiles/file/32329136055.pdfIn PDF document text
    • https://dermatologie-francophone.com/userfiles/file/72387165329.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/gipirekujitagowejupatola.pdfIn PDF document text
    • http://nc-israel.ru/upload/files/pukifumidusezajaboju.pdfIn PDF document text
    • http://maychebiengoduykhuong.com/media/ftp/file/tirale.pdfIn PDF document text
    • https://tumsad.org/img/editor/image/file/67759836313.pdfIn PDF document text
    • https://stvorki.ru/files/file/wevutujurizepobufuz.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/966c26e231cbb9f673eae341cd17746e/66466589408.pdfIn PDF document text
    • http://esebtekstil.com/resimler/files/fokunoruzozuk.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/er9mgms21ckr0rc9gsorphsep1/77592202391.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/vagezovimimil.pdfIn PDF document text
    • http://dolinakrzeptowa.pl/public/upload/ckfinder/userfiles/files/sitevimabaleramalomepena.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/14444285d69f340e8683c7d6eac17f6f/vipat.pdfIn PDF document text
    • http://fantacyhandicraft.com/userfiles/file/kusuvuvafazenoragunez.pdfIn PDF document text
    • http://bn-biz.com/userData/board/file/45450385800.pdfIn PDF document text
    • http://daglichtfilters.nl/ckfinder/userfiles/files/59494856752.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/1jsntm1fggmbknjh3tukcal1bc/popixonixiki.pdfIn PDF document text
    • http://scales-center.com/shop/fck_file/file/wegasod.pdfIn PDF document text
    • http://sameiroeventos.pt/ficheiros/tomijafufimaxusekibi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=tiny+troopers+2+special+opsPDF 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_off0000e487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE487 10564 bytes
SHA-256: 26971dc55525e5bd6128d3fbf5062873c41cd19d2fe0cbcf2359659614028183
font_01_sfnt_off0000fce2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE2 17916 bytes
SHA-256: 8c303c422d61dbbd13aec0f61aa57887c873d04fecb7f70c77774000cef91277
font_02_sfnt_off00012b4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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