Malicious PDF — malware analysis report

Static analysis result for SHA-256 88eb5c25a9350266…

MALICIOUS

PDF

70.7 KB Created: 2021-09-15 11:35:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 40d32e1b6ee571ff3fc95cf741b6f300 SHA-1: ec38517585883e81e1cdc19d6997ae6046aa9353 SHA-256: 88eb5c25a9350266e76fd03b0e876a1f3449e95982b5176047914f57928af39f
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to lure users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these external links. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://baheth24aqari.com/ckfinder/userfiles/files/63545302442.pdf In PDF document text
    • http://royal-pizza.eu/files/file/5945834248.pdfIn PDF document text
    • http://bouwbedrijfansing.nl/userfiles/file/wogitisasolemedozali.pdfIn PDF document text
    • http://www.alliance-bio.com/user_data/editor/ckfinder/core/connector/php/upload/files/35110763816.pdfIn PDF document text
    • http://lakesnwoodskerala.com/uploads/file/49320642276.pdfIn PDF document text
    • http://plafondchauffant.fr/img/user/file/64600748356.pdfIn PDF document text
    • http://iktoktatas.hu/files/file/79409746510.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/16133c8ece55d1---13555021419.pdfIn PDF document text
    • http://ckm-machinery.com/userfiles/files/5472129029.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/malivejafavedudefusoko.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/33413523075.pdfIn PDF document text
    • http://ncdesign.it/userfiles/files/romusexifixatogekodewo.pdfIn PDF document text
    • http://golfvillageonline.com/userfiles/file/genonufoniximuzujezizu.pdfIn PDF document text
    • http://sowiik.pl/userfiles/file/gedawevisojukefase.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/161418de0d5fac---61459262013.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16137abe5eff69---fabetunuwibezavoje.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410f17c10fe---1392020399.pdfIn PDF document text
    • http://lateonsettay-sachs.org/userfiles/file/57347974802.pdfIn PDF document text
    • https://togeltop.net/contents/files/80989720343.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/16141ab5125809---94092845873.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/volasujegadunodowo.pdfIn PDF document text
    • https://unitedpetexpress.unitedreloth.com/ckfinder/userfiles/files/17592131876.pdfIn PDF document text
    • http://hospitalityroyal.com/upload_files/file/70576252640.pdfIn PDF document text
    • http://crmrealty360degree.in/ci/userfiles/files/71383469959.pdfIn PDF document text
    • http://meimagedance.tw/ufiles/files/61689422730.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=mayor+of+casterbridge+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_off0000b478.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB478 10892 bytes
SHA-256: 55b19141e48ea32bdb76665f780bbda0f5830fc03ce0413e79cf5ccf7e63c588
font_01_sfnt_off0000cd77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE589 15596 bytes
SHA-256: 0b065be34b3fdcdfef3fae9f3e912b5c2f36678fefe4c7d826389e94de96c12f