Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f8a8834c24a28af…

MALICIOUS

PDF

85.6 KB Created: 2021-09-02 05:18:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4510dd9e400217055dcde7c8c7890ec7 SHA-1: fd437195786d016709a6abc86dcb1e824aaf8997 SHA-256: 3f8a8834c24a28afdf4b884970ea8a6704265ae526355c4471a12b2ce5c27645
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan payload. Heuristics identified it as a link farm, with many external URIs pointing to various websites, including those hosted on compromised CMS platforms. The document body is heavily obfuscated and unreadable, suggesting it's designed to conceal its malicious intent rather than provide user-facing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9902

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 http://nceed.kr/pds/userfiles/files/dudera.pdf In PDF document text
    • https://autosaloncenter.com/uploads/file/bunilip.pdfIn PDF document text
    • https://aventura-agence.lu/userfiles/files/98256896933.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c39d2a21228---64617316221.pdfIn PDF document text
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/949bc87e41170a85b8d864cca4bcacbf/32579218420.pdfIn PDF document text
    • http://xn--66-6kc8bfmkmjd.xn--p1ai/admin/ckfinder/userfiles/files/gadodaravanevinalobovo.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/2f97a61a390bef5c3926f0d7c19e7b9b/newabol.pdfIn PDF document text
    • https://midasspa.com/ckfinder/userfiles/files/26850527202.pdfIn PDF document text
    • https://flying-vikings.net/UserFiles/file/wuvalidedumumujami.pdfIn PDF document text
    • http://vibestedu.com/_UploadFile/Images/file/ladupezisurelofosifiviw.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a75679836ac---72742562866.pdfIn PDF document text
    • http://ekstelekom.com/userfiles/file/36188329460.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6abd769be---towelutotepomagexapanut.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/wuvejinade.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/ragogem.pdfIn PDF document text
    • https://joebalogh.ro/imagini_ws/62550566626.pdfIn PDF document text
    • http://fvv-hohenfelde.de/sites/default/files/files/xatasurumeji.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/7f71026d6c90fbdd0d1d40da4902ee33/77352930150.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/demezod.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/160900c8c209bb---zatatevemonal.pdfIn PDF document text
    • https://rijst.nu/userfiles/file/96833554956.pdfIn PDF document text
    • http://mictrogiang.com/userfiles/files/jetit.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/g1v71b4dig9p10m1a1rsi7l685/supomenafujigapi.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/qrgujpalffatrpd0oojss5iejm/xevekogawel.pdfIn PDF document text
    • http://www.tramag.pl/upload/file/68979994778.pdfIn PDF document text
    • http://panziofabian.hu/fck_kepek/jajalolarijasipuwa.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/d7eb2c2f54d1d512d7c039452354e563/95929338853.pdfIn PDF document text
    • http://dui-antidote.net/images/userfiles/file/9711439181.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=spay+and+neuter+clinic+monroevillePDF 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_off0000e791.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE791 10864 bytes
SHA-256: a94946e8c3a924e5bf21521d2f75b5358945011525eaae07a4874200b27a05ba
font_01_sfnt_off000100a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A7 17796 bytes
SHA-256: ef5d8b828a5436271b415b12fa2754e85b1c87787c13e696fb868e236c174251
font_02_sfnt_off00012f41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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