Malicious PDF — malware analysis report

Static analysis result for SHA-256 39dc854f28187d84…

MALICIOUS

PDF

86.0 KB Created: 2021-09-10 12:24:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fa5313c86e962025899f85a1ef075ea4 SHA-1: 15e54632f2eb54ab1234e3dc6633f40de9488cb9 SHA-256: 39dc854f28187d84ac9ca7a2dcfc35366b0778bbf1abff068b699d26613c4121
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. Additionally, multiple heuristics indicate the presence of link farms pointing to external PDF files hosted on compromised CMS uploads and disposable hosting, suggesting an attempt to distribute further malicious content or conduct phishing. The ClamAV detection and ML classifier strongly support a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://istanajp2.com/contents/files/58603673696.pdf In PDF document text
    • http://matsusushionline.com/uploads/files/nijusewinarekavadafufuwi.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/9977395134.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16138a2b1b7815---84503081191.pdfIn PDF document text
    • http://energosol.pl/images_cms/file/91060055749.pdfIn PDF document text
    • http://snieznik.pl/userfiles/file/suwosamab.pdfIn PDF document text
    • http://kajo-frings.de/userfiles/file/89049076612.pdfIn PDF document text
    • http://aroma-es.red/yamituki-n/uploads/files/tomekadalebabakususewuwen.pdfIn PDF document text
    • http://kaies.net/upfiles/21090619034334606047v7tr.pdfIn PDF document text
    • https://ukmriptek.org/codeIgniter-hmvc/userfiles/files/30379896165.pdfIn PDF document text
    • https://blugarden.eu/file/86830985150.pdfIn PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/jexamibilabuwap.pdfIn PDF document text
    • https://tranthachcaodanang.com/uploads/image/files/dakuxanowivud.pdfIn PDF document text
    • http://yeditepegumruk.com/userfiles/51265214434.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fbd0037c6b---pozukiguwaro.pdfIn PDF document text
    • https://cicasoftavukatwebsitesi.demowebsiteleri.com/upload/files/53611658185.pdfIn PDF document text
    • https://nhatngudongkinh.phapluatvietnam.com/upload/ckupload/files/budofalavixurinixolas.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/161338e1759644---foxevibudasejufobejen.pdfIn PDF document text
    • http://thegoshow.net/userfiles/file/kiwelevatiwivagul.pdfIn PDF document text
    • http://olymp-kiev.com/temp/fckeditor/file/rofipileguke.pdfIn PDF document text
    • http://teacherandtraining.com/coj_u/KK/userfiles/files/zadanoxesiworebujuzusimo.pdfIn PDF document text
    • http://miass.realxenon.ru/uploads/files/zepugamujasevawenu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+limit+time+on+apps+androidPDF 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_off0000ed6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED6D 10632 bytes
SHA-256: bef55ecf506a1750176ac72706d32a7ff0c032950f11288dd896d1c8229a6071
font_01_sfnt_off000105b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B4 17180 bytes
SHA-256: d854fd717b40b2af14dfbf958c958fa5633996274ebeb32293e25cdb2fe7d24a
font_02_sfnt_off00013210.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13210 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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