Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb70c50e7dc7ff42…

MALICIOUS

PDF

77.9 KB Created: 2021-09-29 14:03:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bb61ab0d03fa8bb80557683d9d925ac1 SHA-1: 9a50b232321810d5f4da234c290f7a2fea188c18 SHA-256: bb70c50e7dc7ff42c611bce60a7e0ebae43270e02d70f6fba9fc61bd44b69d45
116 Risk Score

Malware Insights

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

The PDF contains numerous embedded URIs, many of which point to compromised WordPress installations. The ML classifier strongly flagged this PDF as malicious. The presence of a raw IP address in one of the URIs further increases suspicion. The document's structure suggests it's designed to lead users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614af3a4b2c59---zikajajotegi.pdf In PDF document text
    • http://softwaretesting.kr/club/data/userfiles/file/20210919013534.pdfIn PDF document text
    • http://mathcountsoutreach.org/userfiles/file/powavudu.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/94208973883.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145845dce89b---60723041401.pdfIn PDF document text
    • https://consultingexpert.eu/fckeditor/userfiles/file/28128938484.pdfIn PDF document text
    • http://veterina-naslunci.cz/userfiles/file/fomaduzubigalu.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1614760b6d03ba---pokitabinekebamov.pdfPDF link annotation
    • http://yousefmaktabi.com/ckfinder/userfiles/files/6144652518.pdfIn PDF document text
    • http://fotografieindex.nl/images/uploads/lipemopele.pdfIn PDF document text
    • http://wuyioutdoor.com/userfiles/file/17239773121.pdfIn PDF document text
    • https://resonanceacteurs.nl/userfiles/file/16697342859.pdfIn PDF document text
    • http://landpas.pl/upload/file/mugebamowep.pdfIn PDF document text
    • http://elsped.hu/files/file/30693863273.pdfIn PDF document text
    • http://educaholistica.com/resources/img/imagesck/files/loxufipemosa.pdfIn PDF document text
    • https://035620126.tw/upload/greenkitchen/files/duwolapegig.pdfIn PDF document text
    • http://shsuorui.com/uploadfiles/fckeditor/20210910/file/16312815676616.pdfIn PDF document text
    • http://e-photo.lv/ckfinder/userfiles/files/luzatora.pdfIn PDF document text
    • http://lingeriedediva.com/UploadFile/file/2021092518331973499.pdfIn PDF document text
    • https://ddmmaze.altruistictech.org/documents/img/upload/files/gobekirovexa.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/16152ec482ec5b---80803478159.pdfIn PDF document text
    • https://www.kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/38692212430.pdfIn PDF document text
    • http://diskacme.dk/images/upload/file/822053226.pdfIn PDF document text
    • http://karpatskiles.ru/store/files/sogujasaletobi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=watch+unhinged+2020+putlockerPDF 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_off0000c065.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC065 11052 bytes
SHA-256: 1107c1255c0819fadf8c904519274c6c347d4c6eb97fd2576ad3d1f753a9e2ef
font_01_sfnt_off0000d9ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f1fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FC 20380 bytes
SHA-256: 2d2181d69dc56f9eab3bf38549a9c802a5c365f4c5495bdbb8276f0c85157d4d

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