Malicious PDF — malware analysis report

Static analysis result for SHA-256 d13e0a6ef9d4c150…

MALICIOUS

PDF

80.8 KB Created: 2021-09-06 02:20:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 348dbcbd5d2f9f89a4b1d36bcdb4edf2 SHA-1: 7274e4e49f823bdbf70b81b152f821d77d0b5d08 SHA-256: d13e0a6ef9d4c150ecbe76293dee66d02a73d9ff7b143cf63a461da06992c94d
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The PDF structure and the nature of the URLs indicate a tactic to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/807713a737786a1141a27cbb5d77d34d/zotisowop.pdf In PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/86e25fb2187adf596134b44657afa096/vowakune.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/26470c0d938a2004d863cef6ee10c5fb/93655579386.pdfIn PDF document text
    • https://ecowaytechnologies.com/ckfinder/userfiles/files/waruxabelixitoxota.pdfIn PDF document text
    • http://orderkai.com/uploads/files/vididodosizixusera.pdfIn PDF document text
    • http://suamayin.biz/userfiles/file/83752064515.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161217f05c69b7---bukopoxarabufasasazilil.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/224id4pp54hrti9195car1mv62/lopexakusax.pdfIn PDF document text
    • http://maduraigarlandshop.com/userfiles/file/wivagoribexuzanadutop.pdfIn PDF document text
    • https://steammining.com/userfiles/file/tinuko.pdfIn PDF document text
    • http://3wsystems.com/shipinc/userfiles/files/65186741470.pdfIn PDF document text
    • http://keiganproductions.com/clients/863431/File/33961671278.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/66663018953.pdfIn PDF document text
    • https://diaochue.vn/userfiles/file/90732521208.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/ad7ca1fb163f942136f3c36d5c92a2b3/bojig.pdfIn PDF document text
    • http://grapes4u.ca/sites/all/sites/grapes4u.ca/files/80219359027.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/4671348414.pdfIn PDF document text
    • http://cosmik-kinoteatr.ru/sadm_files/95363357531.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/40804482473.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/11311141630.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/1476cbea519e30de39bf6cbc0d5e188b/93240775695.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160701a077b1ee---diziwu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=belle+princess+coloring+page+pdfPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee46add555---dipexaburenoviwekexadoli.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_off0000d95c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD95C 10752 bytes
SHA-256: fd890d7a1b59b0ef8db788c4edb40b6811fbe496c8a9e78b45a7c99cb37ad967
font_01_sfnt_off0000f1f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F6 16756 bytes
SHA-256: 6fddc3f6b6ddc23e6411d7e827e115ad6402f0d7ac910edc5cb99a5197fd620b
font_02_sfnt_off00011d67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1