Malicious PDF — malware analysis report

Static analysis result for SHA-256 27b1de3b490ec85e…

MALICIOUS

PDF

72.6 KB Created: 2021-09-18 12:06:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1483895e93b72d8ce33e7b76c1ce2cb5 SHA-1: f5620dc312b47a85d21ade37fd04e7c06ccc380f SHA-256: 27b1de3b490ec85e0342e7552479197af6e55f2b3ef405b24a66985b7fa79ba4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with a phishing lure or a downloader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://ccskin.com/geektic/files/64739680896.pdf In PDF document text
    • http://adhunikjewellers.com/ckfinder/userfiles/files/rofitusuzurarabaf.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/k7lgmreotijvm02nj8tb1qbdut/40958548973.pdfIn PDF document text
    • http://motovelo-nmsk.ru/userfiles/file/xipovenejudegon.pdfIn PDF document text
    • http://www.agenbenangbandung.net/file/31947585918.pdfIn PDF document text
    • https://siangyun.com/upfiles/editor/files/pafowatet.pdfIn PDF document text
    • http://yacpa.org/yacpafiles/file/77883232181.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132b456734aa---saxonu.pdfIn PDF document text
    • https://newsru.md/upload/userfiles/files/tevejunopel.pdfIn PDF document text
    • http://harlit.com/upfiles/file/lewalumezonobas.pdfIn PDF document text
    • http://taiwanquinoafamily.com/shopadmin/upload/files/fexapagexul.pdfIn PDF document text
    • http://halanmilk.com/upload/files/21747293557.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec2879233e---kemoxuda.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614341cb4a4c1---tumuporopurukozepim.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/de833h3c5vo4lu8k97vdlchdp4/6912916557.pdfIn PDF document text
    • https://shevian.com/images/file/14344404958.pdfIn PDF document text
    • http://crisismobile.com/ckfinder/userfiles/files/67713069398.pdfIn PDF document text
    • http://alpinist.store/sribati/editor/uploadfiles/86644050194.pdfIn PDF document text
    • https://kettosallampolgarsag.net/imagini_ws/84674769096.pdfIn PDF document text
    • https://kolbandibileklik.com/resimler/files/90637138319.pdfIn PDF document text
    • https://unitedpetexpress.unitedreloth.com/ckfinder/userfiles/files/14258323258.pdfIn PDF document text
    • https://manorhair.com/uploads/files/202109150650233598.pdfIn PDF document text
    • http://samurairamenbar.com/uploads/files/peturumijebubuwisewadufi.pdfIn PDF document text
    • http://tykhchem.com/upload/files/70690872696.pdfIn PDF document text
    • https://himarco.ir/basefile/himarcoir/files/6805603619.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=android+on+htc+radarPDF 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_off0000ba56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD268 16896 bytes
SHA-256: 0a4ac524318c886619e8b2a57f79bf330dc83d4f736082f63045a63ae6fa6876
font_02_sfnt_off0000fe8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8F 10104 bytes
SHA-256: cd6710761f61605c18f9423fe1505483ac80752748bc1213d693ecaed25b8cee

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