Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef65cb2238ddb23a…

MALICIOUS

PDF

72.8 KB Created: 2021-10-01 03:27:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 20a1145cd2ddfa542ef6b80e1b0c1c11 SHA-1: c9c56abc6478535e62ad0b107d3d46fd1def520a SHA-256: ef65cb2238ddb23a70e91c0fd8bf55e9a6a2a30075bfca86e41ac6a1c6c4da6a
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure indicate an attempt to lure users to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • 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 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://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16151286b79821---86627935885.pdf In PDF document text
    • http://verypool.cn/images/upload/File/62076320626.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/65f48e8b4b90e5380a0fbd8fb863fd6e/dapikajulopumabe.pdfIn PDF document text
    • http://musicpark-live.com/userfiles/file/2009888639.pdfIn PDF document text
    • http://zensushialiso.com/uploads/files/84972395742.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/161412030b02f4---7357588867.pdfIn PDF document text
    • http://519pf.com/userfiles/files/rebopajagonozeredum.pdfIn PDF document text
    • https://oz.korytnica.eu/data/files/dubapaf.pdfIn PDF document text
    • http://kingswaytyres.com/project/kingsway/uploads/file/44877308233.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/4bfbaa640828b6bd446fd39c0a466972/bupibilunokabazal.pdfIn PDF document text
    • https://tktravelkorea.com/FileData/ckfinder/files/20210913_3DCAA126841D582C.pdfIn PDF document text
    • http://weighlessthisyear.com/ckfinder/userfiles/files/9340517736.pdfIn PDF document text
    • http://canavesiobruno-architetti.it/userfiles/files/tefajevibonowebagerob.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7819992bc---batetim.pdfIn PDF document text
    • http://0228339500.kad.tw/kads/ckfinder/userfiles/files/patafipefiwitibubita.pdfIn PDF document text
    • http://vina2002.com/uploads/files/lekidevikivati.pdfIn PDF document text
    • http://alde-pace.org/ckfinder/userfiles/files/8204414958.pdfIn PDF document text
    • https://sledovani3.gpshlidac.cz/www/userfiles/files/wirefufesumegutubumogi.pdfIn PDF document text
    • http://shopgraeagle.com/ckeditor/uploads/files/96017418440.pdfIn PDF document text
    • http://www.florentmaussion.net/userfiles/File/dolizuvatik.pdfIn PDF document text
    • https://demetraproject.eu/ckfinder/userfiles/files/zisibajasi.pdfIn PDF document text
    • http://www.patriarca-batiment.com/ressource/site-image/files/70211935795.pdfIn PDF document text
    • http://tomekorea.com/userData/board/file/goguzekekixekafadaxex.pdfIn PDF document text
    • http://abwlondonblvd.com/uploads/files/28445582347.pdfIn PDF document text
    • https://dagvandearchitectuur.be/_files/file/14079333670.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=only+you+can+satisfy+william+mcdowellPDF 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_off0000b88a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB88A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d0a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0A1 10864 bytes
SHA-256: 30f7ee103733a841efa77de1af2313bac1452d7b449892899234df76ba4cc590
font_02_sfnt_off0000e9d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D8 16940 bytes
SHA-256: 56b610a95cd2ff67683c5b83ac053c755e844ea60eb5676178d6a3aa8a5d8399