Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5206295a3a118e8…

MALICIOUS

PDF

91.2 KB Created: 2021-09-20 14:09:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1d8a18cc52635f9b713726b874514088 SHA-1: d845cb4270d94da294dc49d8a66bdea6ca7547f2 SHA-256: d5206295a3a118e8f9f58ffa3c1d4c041fc894bc98584efedcaceaecc56cead4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to websites hosted on compromised WordPress installations, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV also flagged this file as malicious, specifically as a phishing trojan. While no scripts were explicitly extracted, the nature of the links suggests a phishing or malware distribution attempt, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/a74b2520234465f408b6dda045962ca8/najifodetojuzefilekofu.pdf In PDF document text
    • https://limsurempat.com/contents/files/25216983959.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/3871f4f93b726b675aa0dbd1d80e6764/jixusebogoputipov.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210909213123.pdfIn PDF document text
    • https://groupunsur3.com/contents/files/dimifexudukuja.pdfIn PDF document text
    • https://sproname.com/files/userfiles/files/wovojosag.pdfIn PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/sewuzanusopuzinawik.pdfIn PDF document text
    • https://www.loscam.com/lib_common/ckeditor/ckfinder/userfiles/files/71786063800.pdfIn PDF document text
    • http://fra2ange.it/userfiles/files/lesepevu.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/pasufuj.pdfIn PDF document text
    • http://chochosanencino.com/uploads/files/12838603441.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/91944845459.pdfIn PDF document text
    • http://irs-messtechnik.at/upload/sixegotifofa.pdfIn PDF document text
    • https://dhesient.com/media/51587169785.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/zirisokitub.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/mefujonojavisot.pdfIn PDF document text
    • http://graylegalservices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/2767202119.pdfIn PDF document text
    • https://digbijoynath.in/uploads/userfiles/files/24146275360.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/92240097817.pdfIn PDF document text
    • https://phoenixturkey.com/upload/ckfinder/files/wumawutikadew.pdfIn PDF document text
    • http://energyexcess.com/userfiles/file/xapedolu.pdfIn PDF document text
    • http://candientushinko.com/images/file/bowokoxabevovukagagu.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/61092580d8f7c36970cfb9358bc9588f/nekujanaxawezebesukok.pdfIn PDF document text
    • http://gurolmumcu.com/userfiles/file/ridivalite.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=disadvantages+of+social+media+on+teenagerPDF 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_off000100af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100AF 10888 bytes
SHA-256: ee87f37676d90b8243f2e1f1c99e8ec59ce6678ff298fa9e5b07cdf6714f9f80
font_01_sfnt_off000119a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000131b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131B9 17332 bytes
SHA-256: 1e0e6389ec0ec2524d0feb03c3da27a8bf9c47cf26b71f61f381c45ddecfceda

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