Malicious PDF — malware analysis report

Static analysis result for SHA-256 8273099b8d10dd0f…

MALICIOUS

PDF

84.9 KB Created: 2021-09-02 15:19:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 53edff6bef7afd78c08bbb17fb0a6d17 SHA-1: 542f601a346d28088e1cea4daa0ef9a4520fa6a0 SHA-256: 8273099b8d10dd0f13ab5a98b2e54bc0d9b4d436db6af758f0106a5de64df189
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan-like behavior. It contains numerous URLs, many pointing to compromised WordPress uploads and disposable hosting, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics strongly suggest an attempt to lure users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://ambvet-trefontane.eu/userfiles/files/80157121900.pdf In PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/287695fc6585d2a7e626a15e57f50011/44195476631.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/5d1b98fe2e7249d1e555e69dac3cf379/radalokesivadawilavuvonu.pdfIn PDF document text
    • https://crownprolaw.cn/userfiles/Proj_Name//files/tojetod.pdfIn PDF document text
    • https://www.ideaklinikbursa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca0275a782---tigepiximigijakolexovogaz.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/52313013932.pdfIn PDF document text
    • https://zhbiotech.com/CKEdit/upload/files/20913698416.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/juwazixolulunu.pdfIn PDF document text
    • http://billsky.ee/files/file/6038571084.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc272c3b02---99732530218.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160840cb68ab78---26745551528.pdfIn PDF document text
    • https://alibabaoman.com/basefile/alibabaomancom/files/muwobaroriputumulime.pdfIn PDF document text
    • http://haileylusk.com/clients/e/e6/e6412a3df854040bfb282c4f37eddf02/File/zabinebureromaxuvobowuka.pdfIn PDF document text
    • https://ms02bet.net/contents//files/94890238578.pdfIn PDF document text
    • http://take114.kr/FileData/ckfinder/files/20210721_A450A646FD855801.pdfIn PDF document text
    • https://zlato-eu.cz/upload/files/48646144535.pdfIn PDF document text
    • http://wearefamilypalestine.com/clients/3/3b/3bc38fc23f9ffb54b20226cbd6ad6ce3/File/39318540222.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070afc4ca7d5---lididigag.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16075ca11ceda9---vofijeruvawiximif.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d78bd54ca6d---noxutivixin.pdfIn PDF document text
    • http://capital96.com/userfiles/file/68066801874.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098540d0a223---rosubigewetamosek.pdfIn PDF document text
    • https://websbag.com/uploads/files/39918335990.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/pipulafaxisifufazerifixas.pdfIn PDF document text
    • http://autoscuolepintozzi.it/userfiles/files/7906680676.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=lobulillo+hepatico+pdfPDF 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_off0000e67e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE67E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE95 10544 bytes
SHA-256: 5a2b0823234988a0fbabfa02b195c9797d7b00bcacbba09fcf70446a57325cea
font_02_sfnt_off0001167b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1167B 18124 bytes
SHA-256: 826290325c5d4010a8f04d634bca5a3f0c9744fb35b6f4fab87761afe507085c

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