Malicious PDF — malware analysis report

Static analysis result for SHA-256 b271c6d0f6888bb4…

MALICIOUS

PDF

84.5 KB Created: 2021-09-01 04:01:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 08959dd9abf436fa5d75ba120de8c7eb SHA-1: 99abe4dc1abc8eec215a895fcb6a4187a2160f6f SHA-256: b271c6d0f6888bb4356b81ea93201176f7b0aef06c776da28e99ed6aa672d71e
112 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs pointing to compromised CMS upload storage and disposable hosting. These findings, combined with the ML classifier's high confidence, indicate a malicious document designed to host a link farm. The embedded JavaScript likely facilitates the redirection or download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://huntic.ru/uplcv?utm_term=i+was+born+on+a+full+moon PDF link annotation
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16070f459d49cf---fozaxuzane.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a77eb5693fc---jivegemigirulizonixamope.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/waxejaku.pdfIn PDF document text
    • https://gloriamus.org/Uploads/userfiles/files/fusesazijupuliliwek.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/76504084550.pdfIn PDF document text
    • http://www.uds-myanmar.com/image/upload/File/jerusukubipunuguni.pdfIn PDF document text
    • http://lexus-custom.com/js/upload/files/fumumikoje.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/kupatidufek.pdfIn PDF document text
    • http://cutyoursupport.com/userfiles/file/59320888325.pdfIn PDF document text
    • https://greenlakepaint.com/ckfinder/userfiles/files/5688266641.pdfIn PDF document text
    • http://alexanderjamesbackcatalogue.com/userfiles/file/tigipuvodazow.pdfIn PDF document text
    • https://netiko.ge/img/Data/file/14882535925.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/4687412809.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/66469681904.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c434961831---riwaseniwalofozuvuwe.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/59786009637.pdfIn PDF document text
    • http://cerescommoditiesltd.com/Images_upload/files/47238272499.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/f8c5roo5113ua3lqprl3ai44e5/85272846006.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a68060118---16520935207.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/34230311992.pdfIn PDF document text
    • https://rendiamovisibiliglinvisibili.org/file/83996943798.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc8279312b---togoritese.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2d130c6ba---56725648974.pdfIn PDF document text
    • http://doreenindiatours.com/userfiles/file/sisewapuxavigoxa.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/viridupujevibixabujufo.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_off0000e4e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E1 10332 bytes
SHA-256: 8502bc777702754dfa7ed2d38c8663f2441e8d4895c0f8f58b9d13f81d2d4347
font_01_sfnt_off0000fc3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001144d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1144D 18144 bytes
SHA-256: ef003db2f3cdb67b3395938a9a6f2b5076b579ae50e888a51875bc95f50c8aa2

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