Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dee29d75458d261…

MALICIOUS

PDF

96.5 KB Created: 2021-09-02 23:34:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e83be458f7174e832be18406005dbcb3 SHA-1: fd43b276fc7420bf67dbfceba91ff7c4e73aaf24 SHA-256: 9dee29d75458d261dfc367b48111aa44ba4910ce52f79b2e5c7fb48ebb447b4e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to domains flagged as compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO spam. The presence of link farms on compromised CMS uploads and disposable hosting suggests an attempt to distribute malicious content or manipulate search engine results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://muacash.com/webroot/img/files/19939131278.pdf In PDF document text
    • http://frezerovka.by/images/fxeditor/file/18120405259.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-5-31/20210531021027944286.pdfIn PDF document text
    • https://nmg.lv/img/uploads/files/fobabazonexitobekaxijob.pdfIn PDF document text
    • http://tiendanatacion.com/noticias/files/tezujowitoj.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/c971ba50c67dc8e5de30833811914ad4/51865302268.pdfIn PDF document text
    • http://terminsk.by/pics/files/mozuz.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/84462281562.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/wewepagomulabajuxekup.pdfIn PDF document text
    • http://yameitecl.com/ckfinder/userfiles/files/20210726_142804.pdfIn PDF document text
    • http://inbjnews.com/data/cheditor/0603/files/78997175592.pdfIn PDF document text
    • http://pelesiuvalymas.lt/i/File/52093575689.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c29772dc8f8---61527060892.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f57b9d0ee8---12743093477.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607570ac1082f---51540708636.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607552f3b24cd---paxuxop.pdfIn PDF document text
    • http://campingwithconvenience.com/files/files/7801992530.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/c5c32fd73c58486e82be847d38b1537c/mipetafatugod.pdfIn PDF document text
    • https://volgogradexpo.ru/ckfinder/userfiles/files/xolowabupelifuxalu.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/0b6d6786fe6465e6d680e36a8d7aa110/mobemenokasususipimada.pdfIn PDF document text
    • http://baovekhucongnghiep.com/upload/files/77516919174.pdfIn PDF document text
    • https://bselink.com/userfiles/file/fikunuguzomivepavo.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d75a2ed744e---88613282703.pdfIn PDF document text
    • http://101eyewear.com/luutru/files/roreb.pdfIn PDF document text
    • http://bakineshr.az/ckfinder/userfiles/files/wavoleropasoloked.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=differences+between+mass+and+weight+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_off00011036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11036 19136 bytes
SHA-256: 16616137330abcfe966febc6980dbd4aea9b082ef3b41eedc2668983d3fcc4ef
font_01_sfnt_off00014205.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14205 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015a1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A1C 11128 bytes
SHA-256: 2f629f0e3e4235f6a564f964a6919ed26723b01fece46d62bec7920b01e11e5a

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