Malicious PDF — malware analysis report

Static analysis result for SHA-256 0edc9bd2f42c4641…

MALICIOUS

PDF

80.0 KB Created: 2021-09-11 11:45:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: dcb66106a01216d9ad5318f871de5c50 SHA-1: 4f64463428cde7a19a449ec4642c99d2b54967a3 SHA-256: 0edc9bd2f42c464144d3de7abd112671d5f4655ecb78e2bf06114e4b598d36de
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the embedded URLs and the heuristic firings point towards a malicious document, potentially leveraging exploits or social engineering to achieve its goals.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 https://allytemp.ru/uplcv?utm_term=wave+animation+android PDF link annotation
    • http://sunnysolutions.it/uploads/assets/file/46007214725.pdfIn PDF document text
    • http://rafaelokazakov.com/file/rozoboruduxobano.pdfIn PDF document text
    • https://wct.goldcrownresort.com/magazine_files/files/25594273592.pdfIn PDF document text
    • https://i-try.tw/upfile/files/2021/09/11/37831503148.pdfIn PDF document text
    • http://hockjoohin.com/admin/uploads/file/xomeden.pdfIn PDF document text
    • http://jd6618.com/jd6618/file/2021-9/file/LwpCms2021_09_10_22_56_04_5561.pdfIn PDF document text
    • http://viviapalermo.com/userfiles/files/99473144093.pdfIn PDF document text
    • http://longthinhphat.net/uploads/files/56499988141.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130c185d11cf---6750640457.pdfIn PDF document text
    • http://ntouioc.ntou.edu.tw/ckfinder/userfiles/files/72208114739.pdfIn PDF document text
    • http://ibnuaffan.com/ckfinder/userfiles/files/43814038444.pdfIn PDF document text
    • http://frchem.cn/upload/files/didukizatamogafinefewevud.pdfIn PDF document text
    • http://salwex.hu/file/xizabonetodof.pdfIn PDF document text
    • http://hla.vn/upload/files/92983173061.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/e5a16768fdeb3838a2c18f11f8ba1308/pifowafa.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16135c0437adfb---bikojivepibofalojiw.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/22488078695.pdfIn PDF document text
    • https://navliecky.net/userfiles/file/94518131711.pdfIn PDF document text
    • https://tivicom.vn/upload/files/kogetugexatumeperu.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/161382c53529a4---83371406344.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/nukipoxowuzurolositalep.pdfIn PDF document text
    • http://www.rsvpcatering-ar.com/files/imagesfile/sivojipobegalaxurixonivo.pdfIn PDF document text
    • https://charterboatdeliverance.com/uploads/files/goxefariramuxusumimag.pdfIn PDF document text
    • https://rumahbaruku.com/contents/files/xebogox.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/niwoteme.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/0e9386d14576a315ce57868ed7ade59a/98783483387.pdfIn PDF document text
    • 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_off0000d50c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD50C 10252 bytes
SHA-256: 7ef8b2246b39aa006ac5e96609d58effd6d03c7a2a5480299fec0a8472579ff3
font_01_sfnt_off0000ec14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10426 17704 bytes
SHA-256: a3d23faa9db4061a32ef84f12d67ada64b35409a3d4b4393b7980e058cc7acbb

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