Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c2f96a26752c004…

MALICIOUS

PDF

83.2 KB Created: 2021-09-19 13:05:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 56d2240efcd8e1a8c435f2397da7f267 SHA-1: 38c68218fbc84b244862c771662f805a6a2aeda0 SHA-256: 1c2f96a26752c00492bae05160d15a21e20edd2e2421c67ff2e2d50bfb28d330
196 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating a remote-support tool lure. This suggests the document is designed to trick users into installing or interacting with remote access software, potentially to gain control of their systems. The presence of numerous embedded URLs, many pointing to potentially compromised or disposable hosting, further supports a malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://araonline.hu/uploads/file/13879585797.pdf In PDF document text
    • http://njuhome.pl/ckfinder/userfiles/files/83026837685.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/161326dcb9770f---34351461025.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/kebetuvakapudovixunum.pdfIn PDF document text
    • http://kyochonbuenapark.iorderfoods.com/uploads/files/61316858633.pdfIn PDF document text
    • https://mkserwis.pl/userfiles/file/12024162508.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ecabd5f4c8---24291055711.pdfIn PDF document text
    • https://www.bussmann-tiefbau.de/ckfinder/userfiles/files/81615014171.pdfIn PDF document text
    • https://digicpictures.com/downloads/60069946889.pdfIn PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/32972336092.pdfIn PDF document text
    • http://prmakeup.com/Image/files/34374500656.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/161302e4e2fd50---35051186222.pdfIn PDF document text
    • https://kocarbonag.com/luutru/files/romekovisolamawikisil.pdfIn PDF document text
    • http://a2hgghk.handylover.com/upload/files/64905968230.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2a609bd61---19883989771.pdfIn PDF document text
    • http://flyingwedge.com/uploads/assets/file/62877627056.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16143a1c182d87---tizizudulajuwimu.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/latuwirorekuwujurebiz.pdfIn PDF document text
    • http://brno-skoleniridicu.cz/ckfinder/userfiles/files/xifupebovujutiro.pdfIn PDF document text
    • http://johnlillylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/91542682298.pdfIn PDF document text
    • https://pokereshop.cz/data/file/xonojajikiwemipemigu.pdfIn PDF document text
    • http://kondicionery-dzerzhinskij.ru/upload_picture/file/fozorajok.pdfIn PDF document text
    • https://ceccargiurgiu.ro/userfiles/file/32303164414.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613255592b2cc---93331658981.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16133c6d2d8ad6---niwiv.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613ff478aa178---38136554662.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=phone+to+phone+control+appPDF 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_off0000e209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE209 10212 bytes
SHA-256: c2e51111b8fd51526a0eadbc6014f5ac659e9c8c0cf6c0c54301d6d13b50fc52
font_01_sfnt_off0000f8dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DC 17972 bytes
SHA-256: b9e5c9fe6b09295059517610e03cb935207c486567f3dcccf6aeb64e8a9a19fd
font_02_sfnt_off000126f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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