Malicious PDF — malware analysis report

Static analysis result for SHA-256 876274e9bf6d7243…

MALICIOUS

PDF

89.3 KB Created: 2021-09-12 13:22:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 370cfbcc88f0347f978863d0db24745b SHA-1: 97042b144b37f570227d3d91d64195aa639e4f75 SHA-256: 876274e9bf6d7243584d4b322f6eebef22eb8b28105d78ca6ede276fbd85a602
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable hosting sites, which is a common tactic for phishing or malware distribution. The presence of external URIs and a link farm on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://megaprestige.ru/uploads/files/kulufitoguk.pdf In PDF document text
    • https://cobaltinc.org/userfiles/file/51668969193.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/wanavajofupuzemexabizevef.pdfIn PDF document text
    • http://archiw.bibliotekalesmierz.eu/img/upload/files/51083442198.pdfIn PDF document text
    • http://millecolori.it/images/file/vutilusud.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/nudow.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/mosudeduguwinonoven.pdfIn PDF document text
    • http://yibetter.com/data/files/nijufil.pdfIn PDF document text
    • https://veterinarycarefoundation.org/userfiles/file/3011369486.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135e9eeea326---tuzamijonimagosaw.pdfIn PDF document text
    • http://kisito.com/userfiles/file/36297593819.pdfIn PDF document text
    • http://elitvorota.ru/f/file/95149009799.pdfIn PDF document text
    • http://asiancfea.org/userfiles/file/24202256714.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/7877a9e6113aaf48108e9d2b1ea88aa7/15704494051.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/0dta9v9l4qucute5ma9is9urg4/50769562275.pdfIn PDF document text
    • https://dobski.pl/userfiles/file/83553018708.pdfIn PDF document text
    • https://odlingfamily.com/userfiles/file/13408085477.pdfIn PDF document text
    • http://aburobocon2019.mnb.mn/uploads/files/43717082174.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161358f33b7c48---69428779134.pdfIn PDF document text
    • https://yukkumpulgroup2.com/contents/files/59652795824.pdfIn PDF document text
    • http://chinahk-ip.com/chinahk_ip/html/files/editor/file/93234329201.pdfIn PDF document text
    • http://kingcraftviet.com/uploads/ckfinder/files/babanupitiguzomu.pdfIn PDF document text
    • http://juncheng.tw/upload/files/luduzurofifomelavijoma.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=best+mod+apk+store+2021PDF link annotation
    • https://lapdonline.org/file/wegegamorodugikobubaba.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_off0000f6d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D2 10752 bytes
SHA-256: ae8bb187ea015b866d2d5478b9e8fd900aa598c97bf56dbacc59ebd97be8bfbf
font_01_sfnt_off00010fb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127C7 18556 bytes
SHA-256: 9e3880615631c5ca62ac0aa68082b107841a9024e0f2313651e64a57ec461fd4

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