Malicious PDF — malware analysis report

Static analysis result for SHA-256 8433326e10e93eb7…

MALICIOUS

PDF

81.4 KB Created: 2021-08-29 20:57:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0f3414258c30f8958454a270d91d4ffd SHA-1: 4f3d523363c6db4081672c5a35e598e211f23832 SHA-256: 8433326e10e93eb7f269a171695971ad4f205bb19c5412d7537e1e5cf74588db
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many of which point to compromised CMS upload directories, suggesting an attempt to lure users to malicious or compromised sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 6

  • 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.
  • 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://riverside-plaza.com/upload/userfile/files/54623286273.pdf In PDF document text
    • http://posekatzahradu.cz/files/file/belinenemirezasogeretiwo.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16081f1c383468---butifexigimamesowege.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/ferdhbbhd3802njonpssfvk930/rokikuregorudoxi.pdfIn PDF document text
    • http://karmand24.ir/basefile/ehotel724ir/files/pesek.pdfIn PDF document text
    • http://orsini-blasioli.it/userfiles/files/78944392316.pdfIn PDF document text
    • http://conelser.hu/fck_uploads/file/68804110003.pdfIn PDF document text
    • http://bridgestone-ice-cruiser-7000.ru/ckfinder/userfiles/files/rimubotukise.pdfIn PDF document text
    • https://rajatotogroup1.com/contents//files/38504379513.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/a8191b2df8adeb5ae5b9e721a2549656/pufuxomofukisedojo.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/0b90eefaa97f1c4e15c65553b8fc3057/2895266133.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160aab4fc552d8---lesol.pdfIn PDF document text
    • https://gberwanda.com/gbe/useruploads/blogs/files/vejutuwegezereje.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/larexezesikepelapid.pdfIn PDF document text
    • http://baybayankaauamo.com/clients/c/c9/c9e0f772d4a556598cfa564a27137582/File/41972151407.pdfIn PDF document text
    • http://luluscafeonline.com/uploads/files/10679382894.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a6e84230d---83698620141.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/7b192af1b7ed01ca4c2d79dc64495d4b/39036911109.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084c97f881d1---neduludenudeba.pdfIn PDF document text
    • http://haniltm.kr/upfiles/editor/files/11492029163.pdfIn PDF document text
    • http://everestlodgelukla.com/userfiles/file/wupofejupegepogagorazol.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/2275728ab70272fc2e7f652f8fd7d69b/bepitopegovivilagatepe.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160812c488328a---tidanafituzinasidi.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c85726008cc---39652285984.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/60753038571.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=exterior+paint+finishesPDF 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_off0000da67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA67 17564 bytes
SHA-256: 2239268e4d0b39dc5f0018d7b0797f83f661a2ec059a90023f6c1547634f8b7a
font_01_sfnt_off000107e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E2 10492 bytes
SHA-256: fcc3bb9827cd534a0bb8848038b7e022424a9767d3409b058d80be6745c570a6
font_02_sfnt_off00011fb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1