Malicious PDF — malware analysis report

Static analysis result for SHA-256 47e99e6442a6fc9b…

MALICIOUS

PDF

76.6 KB Created: 2021-09-23 23:36:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a06cfe31478a464079cfe7756c17a74a SHA-1: 0679f1ffd0ad4cd8cad19dac8df5f9a05072831b SHA-256: 47e99e6442a6fc9b5267de378c3d0ef1079cfbda65a9ceea0b7e2abab7552f54
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and ML classifiers, indicating malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting, suggesting a link farm or phishing lure. The presence of embedded JavaScript (T1059.007) indicates potential for further malicious actions, such as downloading additional payloads or redirecting the user to malicious sites, aligning with a spearphishing attachment (T1566.001) delivery method.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://quimis.org/js/ckfinder/userfiles/files/newivatedijaradojaxopazuv.pdf In PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3dc808b6f---47908211603.pdfIn PDF document text
    • https://hunde-katzen.at/soubory/79869649118.pdfIn PDF document text
    • http://immobilier-valence-agen.com/userfiles/file/99425401994.pdfIn PDF document text
    • http://www.77ice.com/upload/files/kasogewewedezo.pdfIn PDF document text
    • http://dream-mebel.com/pic/file/fotisasaniroxidabu.pdfIn PDF document text
    • http://ritadas.in/userfiles/file/89159002964.pdfIn PDF document text
    • http://lagunaapartman.hu/images/user/file/24472523609.pdfIn PDF document text
    • http://prepearl.com/uploadsfile/bijokit.pdfIn PDF document text
    • http://hondaotohaiphong.vn/upload/files/1887588384.pdfIn PDF document text
    • https://simpangkanan.com/contents/files/sevorugoderupowox.pdfIn PDF document text
    • http://vivo-mebel.ru/upload/file/dunulabenekogobozef.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/3ee62deca59df0957ab6df401b10d374/lirobix.pdfIn PDF document text
    • https://mimzyonline.com/userfiles/file/zogumimakawubuv.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/mogewilu.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/6884557665.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/37629710905.pdfIn PDF document text
    • http://xn----8sbemnkjd7bfu.xn--p1ai/design/img/upload/file/guvusituxex.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/aecf1176813e34bbf297cd626e2f8484/tesekigetojavidapedunufib.pdfIn PDF document text
    • http://nt-module.ru/ckfinder/userfiles/files/3912964560.pdfIn PDF document text
    • http://ltmetal.com/userfiles/files/jazifekimufeb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+disable+developer+option+in+chrome+androidPDF link annotation
    • http://www.cst.rnu.tn/js/ckfinder/userfiles/files/95585783321.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_off0000c645.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC645 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE57 17340 bytes
SHA-256: ed09323328e200561fc9d61edaa415d33ec3a494c0adc6db7cd71b92938d829e
font_02_sfnt_off00010b57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B57 11064 bytes
SHA-256: dbb357232d8fca2e8ec90d9a79edfb282cf9710c5c8b0f949fd9f405797c54c9

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