Malicious PDF — malware analysis report

Static analysis result for SHA-256 f083118086e97ea0…

MALICIOUS

PDF

80.7 KB Created: 2021-09-13 10:02:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e6ddb77a911eb2610681402cbfca5734 SHA-1: 637c1c13e345889d768ae44d09757729864a9805 SHA-256: f083118086e97ea03c58ea869f9e1369d9de34e3d8faaf8dc09dc602a027ca86
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which are identified as a link farm on disposable hosting or compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were extracted, the presence of embedded URLs and the heuristic firings suggest the document's primary purpose is to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://accapierre.it/userfiles/files/12716402496.pdf In PDF document text
    • http://the100voicesofgospel.ch/fichiers/newsletter/file/lenipipogilorumarafelu.pdfIn PDF document text
    • http://photou.cc/ckfinder/userfiles/files/31689836052.pdfIn PDF document text
    • http://rspon.pl/images/wyswig_images/file/bonap.pdfIn PDF document text
    • http://godsownproperties.com/userfiles/file/wavalejogurab.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/41611524404.pdfIn PDF document text
    • http://www.hausman.eu/images/wyswig_images/file/21611106891.pdfIn PDF document text
    • http://kfbma.org/files/fck/file/ruzunoma.pdfIn PDF document text
    • http://flirdining.com/uploads/files/83434509446.pdfIn PDF document text
    • http://paulbwatkinslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/9344640460.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/sekiturapexumazevimejefux.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad1c8c176c---gomilesokik.pdfIn PDF document text
    • https://tmtteks.com/files/kadogitovofivonekudoso.pdfIn PDF document text
    • http://medwin.kr/userData/board/file/gexokatupemokivakosareni.pdfIn PDF document text
    • https://mingyi-lock.com/data/file/userfiles/files/sotavosigejafoka.pdfIn PDF document text
    • http://roomyab.ir/basefile/roomyabir/files/47603321901.pdfIn PDF document text
    • http://solemarservizi.it/userfiles/files/31680241769.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613a99fa797de---31043418856.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fdf489c797---zewidonimotenigumezasozel.pdfIn PDF document text
    • https://sadhankendra.org/erc/media/90863023826.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/lefipefiju.pdfIn PDF document text
    • https://mollis.rs/files/72475332873.pdfIn PDF document text
    • http://st-ark.it/userfiles/files/tafadilerejarazugamu.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1a46cb955---fexuxobej.pdfIn PDF document text
    • http://aorganboys.handyfriendship.com/upload/files/bexavavu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=minecraft+mobile+apk+homePDF 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_off0000d7e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E3 10804 bytes
SHA-256: 5af59659c4f3edd3851aad6e9c426aecb4f47d448b4779d883f2c9eebabd8ae0
font_01_sfnt_off0000f050.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF050 17192 bytes
SHA-256: ed21038138848180d839b5894d105a9216e8267fc9e9f2eb66eb83b0fe8163ee
font_02_sfnt_off00011ce2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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