Malicious PDF — malware analysis report

Static analysis result for SHA-256 10877cdb97488b5f…

MALICIOUS

PDF

77.5 KB Created: 2021-08-27 18:26:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9b746dce290e92c2d616297063b1072c SHA-1: f956c16566ea606357b9a7d5b10423f62dec8019 SHA-256: 10877cdb97488b5fc4ebf5df19d1ecc30741b7ee6c9653c420fe32ae7ef68e10
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to various websites, many of which are hosted on compromised CMS uploads or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple links to potentially malicious sites suggests an attempt to lure users into clicking through to a harmful destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://shiokerbau1.com/contents//files/dufebokazodoleneniwuvemid.pdf In PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbd6318e65---zibirezubap.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/63563255210.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/sokuzeb.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/libupisedemadazaleroges.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/84401053075.pdfIn PDF document text
    • http://dietaltop.com/userfiles/files/kapajer.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/13695e310f327d5b659ec0183c376906/10020721459.pdfIn PDF document text
    • http://poorclarescork.ie/images/46217627358.pdfIn PDF document text
    • https://aneri12.cz/res/file/98429831848.pdfIn PDF document text
    • http://www.photonics-science.com/ckfinder/userfiles/files/89229151690.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/jibivozajepupidedexomafam.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/93360085023.pdfIn PDF document text
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/u518usofikja0k1muh0kon49hv/diguwejev.pdfIn PDF document text
    • https://leifs-auto.dk/images/file/63890478436.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a22dfa98078---pekuxalex.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/rerd66h56ai8j7cs1v61p3j1mc/xubefam.pdfIn PDF document text
    • http://julianowka.pl/ckfinder/userfiles/files/kawejakikuzamimulelef.pdfIn PDF document text
    • http://2017.letnifestiwal.pl/ckfinder/userfiles/files/muzilekabogunegor.pdfIn PDF document text
    • http://artetendasud.it/userfiles/files/22109752437.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160904e54aaf0c---takutiwepixonesoro.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bd41ffa05cc---3740429632.pdfIn PDF document text
    • https://sindicav.com.br/ckeditor/ckfinder/userfiles/files/juwuxatesolejurubigoxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=ovarian+cancer+psoas+musclePDF link annotation
    • http://perfecturology.cafe24.com/upload/editor/imagefile/44342779767.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_off0000ce0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE0B 10628 bytes
SHA-256: d850225d8e08784a65c155380b3d8461298d95c5a1eb32e29b0f51b262752c07
font_01_sfnt_off0000e656.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE656 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE68 16276 bytes
SHA-256: a3c93b2513ca61a6928265f35bef6d1e1f9c9d33e856e4554d81f62f1aaa46bd