Malicious PDF — malware analysis report

Static analysis result for SHA-256 b913d7d3cfbd809b…

MALICIOUS

PDF

99.4 KB Created: 2021-06-26 13:04:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4e770f89654d0505683be92e08d2ee55 SHA-1: fc1c1a409a264521fa8e0b704f802ea693131317 SHA-256: b913d7d3cfbd809b36d683c9925d8b8ad9466b3593b5f82a049a73ae6a0a838d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript and a large number of external URIs, many of which point to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are designed to host phishing content or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9800

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 https://coretry.ru/uplcv?utm_term=critical+path+of+project+network
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16094043c6f7bf---29466748058.pdf
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/90af4643ab4a065772bbd05c15eb6d78/zetevesodefidedikilar.pdf
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/toxifijexi.pdf
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/78055f15a1ca18766f2b756b07045577/19371029984.pdf
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f83f6f8a1---rizivunibavosur.pdf
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a61677c6fdd---55553510673.pdf
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16093fb6778a12---nediboraf.pdf
    • http://insureatkk.com/ckfinder/userfiles/files/2868226018.pdf
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/44275973b0d01fa19e9ccefa4bb27cda/63630487555.pdf
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/tadujimodorogimupuvupuwo.pdf
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/666538eefaeb850979f96b40bed3e940/64399113305.pdf
    • https://amitadevnani.com/userfiles/file/25343610712.pdf
    • http://epoch-making.jp/js/upload/files/kakizepagube.pdf
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/b0be530fd7559db0ef80bcb11b017212/57737636391.pdf
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/0e5e05ce9131a8ff33d34a715f28ee70/wezoko.pdf
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a143145be10---juzefugi.pdf
    • http://brightwayconsultancyservices.com/userfiles/file/ramumelovaguxabizomelusux.pdf
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/3e673527e383904d2a444624b51ddc24/xiduguxevedofesopafidaru.pdf
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a0529e8b58a---silizutizupijapajax.pdf
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16072d9a5a58dc---xogutojaru.pdf
    • http://soflocops.net/clients/81266/File/35200355105.pdf
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/cd883489d8696bc021b8ead49798a3c0/39371927036.pdf
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/465b295961990d0490827ba4b7cd6ef0/todezomojojeginerazeku.pdf
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/t5l1cvmcb9o0j260n57nl8f1ot/fexinowunufabewexidipeni.pdf
    • http://mariopresto.pl/userfiles/file/72381563580.pdf
    • https://tidaksusah.com/contents//files/dokufogoweme.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000122e2.bin
f8c2682d5bc2d8db8b446fd2bc33d8bd4b34b950b30d8bd69f58982066f80b15
pdf-font-stream PDF embedded font (sfnt) at offset 0x122E2 10748 bytes
font_01_sfnt_off00013b91.bin
2d5c809dc249173542758e52df34741a37ffc2ac81fc603ee71052d83e774b07
pdf-font-stream PDF embedded font (sfnt) at offset 0x13B91 16868 bytes
font_02_sfnt_off000167da.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x167DA 16792 bytes