Malicious PDF — malware analysis report

Static analysis result for SHA-256 eacb56d19453c5f5…

MALICIOUS

PDF

81.6 KB Created: 2021-09-20 07:56:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 827dcb88a179f50b19252332c1513c74 SHA-1: 861f2313aa91ebbb38d49ea1739408b3547674e0 SHA-256: eacb56d19453c5f5b533a0e6d90f6623408abb924aeeb8641361c6598aff9897
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier. The 'SE_CLICKFIX' heuristic indicates a social engineering attack that instructs the user to press Win+R or paste a command into a terminal, a common tactic to bypass macro restrictions and execute arbitrary code. The embedded URLs, while many are marked benign, point to a link farm strategy, and some are hosted on potentially compromised or disposable domains, suggesting an attempt to obscure the ultimate payload delivery. The document body is heavily obfuscated and unreadable, but the heuristics strongly suggest the intent is to lure the user into executing a malicious command, likely leading to the download and execution of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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 https://chuyennhakienvangvn.net/upload/files/56868577087.pdf In PDF document text
    • http://nsmpublicschool.org/slbdavbatala/userfiles/file/sefepevutoreramuf.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16143db2ac8e5c---xerefolavurodaligobipu.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/zaniladepananipajepon.pdfIn PDF document text
    • http://hyundai-baoloc.com/luutru/files/54023947318.pdfIn PDF document text
    • http://alienaquatics.com/home/gb/public_html/ckfinder/userfiles/files/wegaw.pdfIn PDF document text
    • https://ppntassone.it/dati/upload/file/86892528900.pdfIn PDF document text
    • https://jagamimpi.net/contents/files/kinifakumepubozo.pdfIn PDF document text
    • http://gz-chengeng.com/uploadfile/files/bebufukitixudifiw.pdfIn PDF document text
    • http://khaskhaan.mn/uploads/userfiles/files/31057628879.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/49939fa86060f366d5ec7d30c100dd68/vopagezu.pdfIn PDF document text
    • http://bilafafafa.com/shopadmin/upload/files/24765987592.pdfIn PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/wamivademini.pdfIn PDF document text
    • https://movimientofamiliadejesus.com/images/uploaded/file/61115233734.pdfIn PDF document text
    • http://xn--42cfa4ewb0a0b3fwh.com/imageupload/files/27850243118.pdfIn PDF document text
    • http://melvin.cz/data/57281097666.pdfIn PDF document text
    • http://ipayon.com/root/FCKeditor/file/14148344469.pdfIn PDF document text
    • https://rajnnuhiddje.se/userfiles/file/48738437914.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/36a91ca10df2ad0d3c7d7d9125b4bf36/gezafeserutowosozevi.pdfIn PDF document text
    • http://agriturismolataggiasca.eu/userfiles/files/70284632057.pdfIn PDF document text
    • http://siblom.ru/files/upload/file/42457386816.pdfIn PDF document text
    • http://commissioncollectionlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zamovudoz.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/28180138546.pdfIn PDF document text
    • http://aloisiquadri.it/userfiles/files/funototawobuvosofamaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+change+folder+name+in+androidPDF 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_off0000d8f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f104.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF104 18368 bytes
SHA-256: db9824b556b0706fbadf031a224bab345fb0923a0b009f8890a676b859c0441e
font_02_sfnt_off0001205c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1205C 10832 bytes
SHA-256: 3402a2b78ad1913932b57b1b24d857031268d82dc513e65cc9cc612366e84e58

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