Malicious PDF — malware analysis report

Static analysis result for SHA-256 998b2590b09b1d1d…

MALICIOUS

PDF

78.8 KB Created: 2021-09-27 12:03:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0965c63c4c7ddd9ed0f1a07cb5f87aaf SHA-1: 9b074c28d61f98a7aaada49bc67660141d29c95d SHA-256: 998b2590b09b1d1de68507ee8a3d2e89595c1019bed476c5cd0fbc073ec71186
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as a phishing trojan. It contains embedded JavaScript and a large number of external URIs, many of which are hosted on compromised or disposable domains. This indicates the PDF is likely used to redirect users to malicious websites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://crysiq.ru/uplcv?utm_term=free+download+sukhmani+sahib+path+full+mp3 PDF link annotation
    • http://temple.mo/userfiles/file/mujogisako.pdfIn PDF document text
    • http://k-souz.com/userfiles/file/wupulale.pdfIn PDF document text
    • https://granitnet.hu/editor_up/30157569512.pdfIn PDF document text
    • https://konferencii.ru/js/ckfinder/userfiles/files/joputimavumofugusinigopo.pdfIn PDF document text
    • http://qdsenfeng.com/data/files/posawitodanapiki.pdfIn PDF document text
    • https://khmernative-rice.com/userfiles/file/pefexigamovo.pdfIn PDF document text
    • https://bisleri.genefied.co/ckfinder/userfiles/files/gadurisadibulomer.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16137a68e3d8dd---vilopuxerad.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/79lq3ot7h8nqn00nkn09nfmiic/tixokunod.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/tuzunubukeporenox.pdfIn PDF document text
    • http://szentistvanpatika.hu/upload/file/besatedexikitagomu.pdfIn PDF document text
    • http://mebel-moscow.com/content/xuploadimages/file/mukigivofuxab.pdfIn PDF document text
    • http://studiocariola.com/userfiles/files/98357732968.pdfIn PDF document text
    • http://ovecollection.com/royal/admin/images/products/file/32683451461.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/20219231649376399.pdfIn PDF document text
    • http://9262895.ru/ckfinder/userfiles/files/21119870889.pdfIn PDF document text
    • http://squarcialupirelaxinchianti.com/writable/public/userfiles/file/53037977029.pdfIn PDF document text
    • https://pustelnik-budownictwo.pl/ckfinder/userfiles/files/redoruxiliduf.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/649762987.pdfIn PDF document text
    • http://khangvietdn.com/uploads/file/tovameramif.pdfIn PDF document text
    • https://christianschoch.ch/userfiles/file/vuduzotezaxewolagakibo.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135e9eeea326---tuzamijonimagosaw.pdfIn PDF document text
    • https://petrovsky14.ru/docs/files/60681131549.pdfIn PDF document text
    • https://dhesient.com/media/nuwanegegir.pdfIn PDF document text
    • https://vleek.com/uploads/files/94865326643.pdfIn PDF document text
    • https://eminentland.com/admin/userfiles/files/64684187133.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_off0000c31b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC31B 20880 bytes
SHA-256: 88ab2efe470af540b1adb49a30ab5b400511724acd6aa101c4933c644271a78b
font_01_sfnt_off0000f93e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF93E 11332 bytes
SHA-256: 8ffe0ffab97106cbbe5a00afbd3295505c163cc38a93c276032437623c3557d9
font_02_sfnt_off00011387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11387 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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