Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac04ab49f23ff629…

MALICIOUS

PDF

88.9 KB Created: 2021-08-03 02:27:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e1e825a0138e116cd1b12087bb668837 SHA-1: adf9ddcf87facc405edb7b76724ffde79f65f6a3 SHA-256: ac04ab49f23ff629180d46a4d25b32b464cfa92041983748deb6ac35e0620ec2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to potentially compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely serves to redirect the user to one of the listed URLs, which form a link farm designed to obscure the ultimate destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://motoren-adachi.com/js/upload/files/89358166216.pdf In PDF document text
    • http://reclameindex.nl/images/uploads/89548870728.pdfIn PDF document text
    • http://worldcar.jp/userfiles/files/6889205181.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160751e2e0a0d4---jefikakadan.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/lhmhk129eo63r2nrb7jblk7png/26760566318.pdfIn PDF document text
    • http://heyumpnd.com/userfiles/file///dazorugatoraso.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/xagiravegofevewajurozaged.pdfIn PDF document text
    • http://sequoia59.com/clients/867919/File/96726873199.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b998e02737---gopudaruz.pdfIn PDF document text
    • https://cihangirhotel.com/upload/ckfinder/files/71671496325.pdfIn PDF document text
    • http://kaies.cn/upfiles/210802083537301180yts76d.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4a46517ae---mizomanazer.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608f4f90e6ed0---solomaxisototetabepulefu.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a0bd46167f---kudirojaxoru.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160efd4060da01---96238082383.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/a298565f07d0ecfa13ce62fc4e8d4b18/80118089628.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/tilabinufolirufipogiwaki.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160deed7e72082---71051357953.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/89383093200.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/56969926134.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/rexukemimu.pdfIn PDF document text
    • https://elmaga.lt/components/com_mijoshop/opencart/image/data/files/panumazadi.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8f795bb852---90279163466.pdfIn PDF document text
    • http://karthikeyanjayaram.com/userfiles/file/40337418018.pdfIn PDF document text
    • https://ph2020.org/ckfinder/userfiles/files/mosiniwoburutivi.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/0r2ehfspulea0l8ouvah0tcabk/26236703279.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=ozymandias+poem+summaryPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f979.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF979 10708 bytes
SHA-256: 1ceb02ae8db31c8dfc0976cb97a97e573bd6fee85669860dab3100ad1efd432c
font_01_sfnt_off00011207.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11207 16688 bytes
SHA-256: 2a40643f0dd5dcab0383c1bb2beb2702b002d0773df0130b4be53c6c5245f1d3
font_02_sfnt_off00013d02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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