Malicious PDF — malware analysis report

Static analysis result for SHA-256 a954ed808e753bb5…

MALICIOUS

PDF

84.8 KB Created: 2021-10-05 23:17:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 9f69027918fec798c5c2de35bb4fc704 SHA-1: 4a672a8f837559efa7bc646b97ba261d3163db42 SHA-256: a954ed808e753bb5913f0057414de14d68886f29c7b89c2b12a2849fc3f1cc5b
164 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of a download button lure further supports this. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://arerp.kr/data/file///fadigafe.pdf In PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/1834248251614a242b2fd46.pdfIn PDF document text
    • https://aletihad-group.com/userfiles/files/teverosirawutilazudobob.pdfIn PDF document text
    • https://www.passion-rnd.com/upfile/files/2021/09/05/kitilojavi.pdfIn PDF document text
    • http://smarttechsolutionukltd.com/uploaded_files/userfiles/files/kitujodagiwuvixoluleteg.pdfIn PDF document text
    • http://15449010.com/FileData/ckfinder/files/20210904_7C4FA9E98BFF58F5.pdfIn PDF document text
    • https://specializzati.tecnaevolution.it/dataload/ckupload/velomuvujirejunigegup.pdfIn PDF document text
    • http://aqua4you.hu/userfiles/file/lijotalagibidigezes.pdfIn PDF document text
    • http://rhythm-thailandagent.com/attach/file/84865561860.pdfIn PDF document text
    • https://athenaeumchessclub.com/ckfinder/userfiles/files/9277033408.pdfIn PDF document text
    • http://bhavalaya.org/ckfinder/userfiles/files/lurebekawosiliretune.pdfIn PDF document text
    • https://altstudio.be/app/webroot/uploads/file/suzala.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613970a05c222---67249291023.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615c9f23cd8b0---60863168298.pdfIn PDF document text
    • http://glampingcaravan.com/userfiles/file/20210911121106.pdfIn PDF document text
    • http://j1ent.com/userfiles/file/20210922193217.pdfIn PDF document text
    • https://rh-h1tapi-turbo.com/contents/files/zaverido.pdfIn PDF document text
    • http://rlponder.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/93714904025.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f73ca79d4a---98442037817.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/161523fdd19085---69068497576.pdfIn PDF document text
    • https://marjoyunlar.com/calisma2/files/uploads/pokezezilarunavu.pdfIn PDF document text
    • http://vatlieulamnha.com/media/ftp/file/dimujaf.pdfIn PDF document text
    • http://skyrybupaslaugos.lt/uploads/files/28026868132.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///2021913161022346.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=magick+in+theory+and+practice+pdf+downloadPDF 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_off0000de2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE2D 20524 bytes
SHA-256: 90459c921217a54e2b0fc7251fa857fa6232dc58b0423d921e6bcbddf123a26e
font_01_sfnt_off000113be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113BE 11016 bytes
SHA-256: 0fc42bde3aa15bba5e4f69edfd68408616bb555dc0ea956aa551bae4af1c3bb1
font_02_sfnt_off00012d2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1