Malicious PDF — malware analysis report

Static analysis result for SHA-256 88d8c160069d6dfe…

MALICIOUS

PDF

72.6 KB Created: 2021-09-05 04:34:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cc3d1015534e666e33f9fa9878230712 SHA-1: b9f1eec7cf99bb203167a27a233faf3102e99812 SHA-256: 88d8c160069d6dfe5ea57356c8011d6bbc4b62244c0d9511da19fb6d070d354b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or malware distribution lure. The document functions as a link farm, containing numerous URLs pointing to external sites, many of which are hosted on compromised or disposable domains. The presence of embedded JavaScript, though not explicitly detailed, is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://0286869143.com/editor_images/files/90267592750.pdf In PDF document text
    • http://apexnepaltravel.com/userfiles/file/1424103161.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/genolimelazipudukikafati.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202104/file/kopavetar.pdfIn PDF document text
    • https://ewt.cz/res/file/70826634025.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/ae882335d53635b64818829dd79ad095/paruxofer.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/19422628932.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079c9fc31c11---40417715101.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/4b15caf8c0a5a9f0c94f9aba9ec4d7e1/fobumorogotebejoweseku.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e007d23773---fufipob.pdfIn PDF document text
    • http://goodmix-psc.com/userfiles/files/78917690649.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c661ceb6b2c---widomipakajuto.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/olcju79d0ggjd5v2q5tiugn3jh/9304252841.pdfIn PDF document text
    • http://epwuae.com/userfiles/file/vesewowaratuxepokelod.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/ritoxitumigafix.pdfIn PDF document text
    • http://hnspkjx.com/d/files/fupopodigarudovavexali.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160841b6dec31e---96891713929.pdfIn PDF document text
    • http://ohsongpharm.com/ckfinder/userfiles/files/25437534697.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f9246087c---7481761859.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160b2cdc6c0aad---89047099371.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/94okglvm8317ru3e9h24p4c7be/niforagi.pdfIn PDF document text
    • https://clubon.top/uploads/files/sakufadiguju.pdfIn PDF document text
    • http://smartpaintingplus.com/userfiles/files/petegokoxaluzosigilov.pdfIn PDF document text
    • https://migger.dk/userimages/file/bagipaxumamijokelakagi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=malaking+titik+at+mga+bantas+worksheetsPDF 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_off0000b5f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5F1 10868 bytes
SHA-256: d54063f2e1b51dbe638da1d30eb271a28ef2bd32c0624a2ed5f6424b1ab11fba
font_01_sfnt_off0000cee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEE9 17664 bytes
SHA-256: 8c4dfdef7d64ceb156f613d0fffbd2676e918cce1c1843817f0e49749a54a155
font_02_sfnt_off0000fd35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1