Malicious PDF — malware analysis report

Static analysis result for SHA-256 577b89e71c1c642e…

MALICIOUS

PDF

97.6 KB Created: 2021-06-29 10:43:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: faf4b896257c8d8cb9c86f5746debfc5 SHA-1: 09b9a5476bdff2d0fa704c6d0be75bf3242959b9 SHA-256: 577b89e71c1c642e4276118de3d673196e5f95773276bfeac6f1a2574cb4322b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to numerous distinct hosts, many of which appear to be compromised WordPress sites, suggesting an attempt to obscure the final destination or distribute payloads. ClamAV and ML classifiers strongly indicate malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9881

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.
  • 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 http://aaykpn.com/uploads/editor/files/tamotudewifazisaguritu.pdf In PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/kbqkhvqk5khho39vk7e2n8go25/tanofoxefenomelo.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16094304fe3621---35383182331.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/bsi9nq7gfeb9ionk6tehbfvoup/65686943627.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16087cd3a9db37---jibawi.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/30391358626.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/ecd9c648285116e35554ac2b0275c5ba/lilegeruvo.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a09304c7504---vebemixudurukefebaxepe.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa4ddec3feb---45832201720.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bd641829c00---76798340165.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec28f8b911---52767905616.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/63881440951.pdfIn PDF document text
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/61428884526.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/10cb54b1bb3971c072c849d5d13fda1e/tidokoxe.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608988cadc9a5---lexejevidunorakofawuzi.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e62db00b3---zolaturigubugaxalujuz.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/70qisa9okrqaq1frapr39sq0u1/jatirabo.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9ec130eb260d6c97b7465807ca830c0b/zibemenodagurofufotib.pdfIn PDF document text
    • https://medtek.vn/storage/file/kikibewivu.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/30175124087.pdfIn PDF document text
    • http://anatolianlgs.com/userfiles/file/renuvuzibidikejakome.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/8dqjham68ked9mup9jfe8jtfj4/50479962529.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=yap+meaning+in+englishPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000f45a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF45A 29412 bytes
SHA-256: f6b76db5fa60dfd2ffde07d209d08b5529f5c666808433906c22a491b5deb27b
font_00_sfnt_off0000dc49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127F0 2124 bytes
SHA-256: 082a8bd973c5df465d11be9e817886cbca2c033d560e7aebf2073011814cd1e5
font_03_sfnt_off0001319d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1319D 10364 bytes
SHA-256: 98f2b2aeb738e0f70a9b0d575174ad8b26c6986e20660155f3634b29916e372b
font_04_sfnt_off000148bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148BC 18464 bytes
SHA-256: 3172fbf3b46be256664f684fd4f5fac64c72b40719d5c3c103dfa39b6b544571

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