Malicious PDF — malware analysis report

Static analysis result for SHA-256 320d968e338150c0…

MALICIOUS

PDF

83.9 KB Created: 2021-09-23 13:20:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8e7c235f3b01c3031b7d1c0318a0724e SHA-1: 4ece6102e110a5e554ec6368d2578d1cf7de366b SHA-256: 320d968e338150c08830da7de8f7b54ba3d4697960acd65f2a4b068366df5bd0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as a phishing trojan and by an ML classifier. It contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. The presence of a link farm pointing to multiple PDF files, some hosted on compromised websites, suggests an attempt to direct users to malicious content or further infection vectors. The embedded JavaScript likely serves to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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 http://www.jucadent.es/ckfinder/userfiles/files/rodamoziru.pdf In PDF document text
    • https://ethnicminorities.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/96268819346.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/33496883045.pdfIn PDF document text
    • https://www.marjojaspers.nl/ckfinder/userfiles/files/91012599574.pdfIn PDF document text
    • https://vayamcs.com/content_files/files/soxegirerijatojenawix.pdfIn PDF document text
    • http://ntvietnga.com/upload/files/pajabudezovopimiloxeb.pdfIn PDF document text
    • https://synodradomski.pl/userfiles/file/fanumido.pdfIn PDF document text
    • https://atlaskvartir.ua/data/uploads/files/zolokuzekedewekonob.pdfIn PDF document text
    • http://jsqnchem.com/upload/files/81404419962.pdfIn PDF document text
    • http://eva.am/files/65fe59959b1d7269.pdfIn PDF document text
    • http://nbc.com.vn/ckfinder/userfiles/files/37705900622.pdfIn PDF document text
    • https://imahima.xyz/js/ckfinder/userfiles/files/58374263794.pdfIn PDF document text
    • http://helder-effect.nl/userfiles/file/28173150008.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/78f92dcebb4d29bed2bbbe107dfde095/81432871740.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614741c0e4aed---14348967669.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/161481dcfd11bb---16299579628.pdfIn PDF document text
    • https://lose-weight.tw/upload/files/wagexugubege.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614901dacb430---dusifafuguruwefemevilo.pdfIn PDF document text
    • https://vaitinhdien.com/app/webroot/upload/files/16628676542.pdfIn PDF document text
    • http://kramnyca.info/img/upload/editor/file/42899956586.pdfIn PDF document text
    • http://rioairporttransfer.com/ckfinder/userfiles/files/folipujewuwi.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/161446e681f2e9---fosufedevevedobodipe.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/dakuvinejipuza.pdfIn PDF document text
    • http://napiarsaigh.com/images/60195108706.pdfIn PDF document text
    • http://santiagoporter.com/js/ckfinder/core/connector/php/files/48610816199.pdfIn PDF document text
    • https://hippodrome-compiegne.fr/www/uploads/file/gafolejelegepebadegajibi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=movierulz+2020+teluguPDF 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_off0000e732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE732 10308 bytes
SHA-256: a9291ed05189b9d539e2a9041b7b340abd18b34696ac19c16b30e65812963cd7
font_01_sfnt_off0000fea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA6 17068 bytes
SHA-256: c7d7d777ecd90bfbf24b95a24efc307d9934f4e94ac765a4c8f625005c63a873
font_02_sfnt_off00012a61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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