Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4a72e5eb310b273…

MALICIOUS

PDF

81.9 KB Created: 2021-09-19 23:57:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: b079f673d9d51c9489c674c89705abb4 SHA-1: 155354da458049b96461999ba0ffbae53c953bd2 SHA-256: a4a72e5eb310b27351bc4ab75aef7ca5b51405e1a186ad87cc8d737a2095c9cc
124 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting, suggesting an attempt to redirect users to malicious content. The ML classifier strongly indicates maliciousness, and the presence of link farms and lures for downloads points towards a phishing or malware distribution scheme. No specific family is identifiable from the available evidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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.
  • 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://chcial.ru/uplcv?utm_term=god+of+war+apk+download+android PDF link annotation
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161467b7de11ef---81845674355.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/51848045173.pdfIn PDF document text
    • http://www.tlo.ntou.edu.tw/ckfinder/userfiles/files/64765356489.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/161457597e820a---10477829987.pdfIn PDF document text
    • http://blueview.nl/app/webroot/files/userfiles/files/46510145588.pdfIn PDF document text
    • http://careerpathrecruitment.com/swapscan/app/webroot/js/ckfinder/userfiles/files/7179622171.pdfIn PDF document text
    • http://bzws.zhanyougame.com/ckfinder/userfiles/files/10464277018.pdfIn PDF document text
    • https://dejavuruse.com/userfiles/file/buxoripetikiwujajowes.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/09304db68bde51c8120c80a8e4fdd70e/xujotedofekozuwewofakowez.pdfIn PDF document text
    • http://one9five.com/userfiles/files/zitefo.pdfIn PDF document text
    • http://osteriailgalloelinnamorata.com/userfiles/files/sisiveruporikeni.pdfIn PDF document text
    • https://digiconelectronics.com/media/wejujurowekuzalazo.pdfIn PDF document text
    • https://vilnius.cvzona.lt/resources/img/files/71245693504.pdfIn PDF document text
    • http://lamarchesainterita.be/lamarchesainterita/imgdb/news/files/14912719805.pdfIn PDF document text
    • http://cleanking.net/userData/board/file/ruvalisavanalej.pdfIn PDF document text
    • http://grupophi.es/uploads/files/16393191085.pdfIn PDF document text
    • http://dreamcatcherltd.com/userfiles/file/22626711716.pdfIn PDF document text
    • https://cyklo-wellness-penzion-palice.cz/content/rimagowa.pdfIn PDF document text
    • https://xn--fct8ml6mwue.tw/uploads/files/rurulimakev.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/9648203077.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/366fbce2536de999f54c72b86de59e1e/51435846397.pdfIn PDF document text
    • http://studiodispirito.it/userfiles/file/12230779478.pdfIn PDF document text
    • http://bn-biz.com/userData/board/file/37967380838.pdfIn PDF document text
    • https://indiachristian.org/uploads/files/sigof.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_off0000de23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE23 17168 bytes
SHA-256: d365b461bb191f0fb92fc8f8fc40ebea5df0f0cd20adc3be798d46306e818cc0
font_01_sfnt_off00010a9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A9D 10312 bytes
SHA-256: 957e344c1463eaccf4424aaa563907b2677bb4c7f8bdc2ffec33a4c5527ac495
font_02_sfnt_off000121f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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