Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfa330fef905d645…

MALICIOUS

PDF

68.6 KB Created: 2021-09-22 12:45:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: eefd62ffe72c44f440d8c3436350e0c4 SHA-1: 3412ce3ce30a43cfaec95dc4d77cdbc8cd20c653 SHA-256: dfa330fef905d6453b81287ba9b8f53bf3f460db85b961d91a2754935dcc34de
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a significant number of external URIs, many hosted on compromised WordPress sites or disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to trick users into downloading a second-stage payload or visiting a malicious site. The embedded JavaScript is likely responsible for initiating the download or redirect.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://garglob.ru/uplcv?utm_term=nfs+no+limits+offline+mod+apk PDF link annotation
    • http://pharmorgsyn.com/upload/files/95593198035.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/vofalikejunujuvu.pdfIn PDF document text
    • https://reaga.net/js/ckfinder/userfiles/files/10298228535.pdfIn PDF document text
    • https://euronuts2009.ge/files/files/valavovapukovumesotilimi.pdfIn PDF document text
    • https://sca-eagleegg5k.com/ckfinder/triplebuserfiles/file/91679332027.pdfIn PDF document text
    • http://associatedreclaimed.reclaimedoils.com/userfiles/files/denipulexitadomenu.pdfIn PDF document text
    • http://chataphan.com/file_media/file_image/file/dutigasuputiwuduza.pdfIn PDF document text
    • https://pre-www.bridge-college.com/uploaded/ckeditor/files/44064307690.pdfIn PDF document text
    • http://misr-consult.com/userfiles/file/rugurazasejozekave.pdfIn PDF document text
    • http://yokohama-model.com/userfiles/files/22599805665.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613a408abf43b---mesuk.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/96975670595.pdfIn PDF document text
    • https://magatek.com/documents/file/11475717560.pdfIn PDF document text
    • http://snailgame.ru/upload/files/20210919185922.pdfIn PDF document text
    • http://kotrackusa.com/fckedit_file/file///20210910_15_3_9.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4cc966527af4569ef725c95badeedeb1/naroroxema.pdfIn PDF document text
    • http://tutaylamhet.com/storage/ckfinder/files/7350181300.pdfIn PDF document text
    • https://www.aaptuk.org/ckfinder/userfiles/files/jemaruwuvetikorebixef.pdfIn PDF document text
    • http://firesecurity.sk/userfiles/file/terapekon.pdfIn PDF document text
    • http://fajni3333.fun4two.pl/uploads/assets/file/pupopipapizu.pdfIn PDF document text
    • http://systempro.kr/userData/board/file/suderufitezofimavide.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/161350c11a22ec---19798047712.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/f0d2d92bfe2523869b774d5c6070986b/jubodebepawek.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/nuxanozajuturewupe.pdfIn PDF document text
    • https://majubesar.com/contents/files/wudowuz.pdfIn PDF document text
    • 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_off0000b0fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c90f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC90F 14260 bytes
SHA-256: ffb1708f8d69a5a09ddb69f04a994c88ad6da1e2c62394cc192b063e0dee626d
font_02_sfnt_off0000ec84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC84 10628 bytes
SHA-256: 8c900c3f9f1c9c6807a8945221cc361448771e2a3e75907972c534fc63cfe175