Malicious PDF — malware analysis report

Static analysis result for SHA-256 482757e44ef56ec5…

MALICIOUS

PDF

78.8 KB Created: 2021-09-20 04:50:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 93d068d1a9f0c60849cf48721cfb6df9 SHA-1: cf010fdd43752394cdb116dbebeff7df630e45dd SHA-256: 482757e44ef56ec5a7a865c87f6de8d67c85f0a1396b356a86fc961b58041de7
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm hosted on disposable domains. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://jxlmedu.com/file/files/20210914_174744.pdf In PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/317107aa266de65deb932ab5818b629d/nokoratogowiserego.pdfIn PDF document text
    • https://brianspradlin.com/userfiles/file/ninuga.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1613b74f22da3a---garuribobejonolobil.pdfIn PDF document text
    • http://columb-sklep.pl/userfiles/file/nawerekuragarinazeke.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/nigopavamalopusivivax.pdfIn PDF document text
    • http://canadianrockies.ca/files/file/71514675178.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/5f8017a5df58eee46f4c0ee8877953bc/15291580632.pdfIn PDF document text
    • http://dienlanhhuubinh.com/upload/files/bixanakotamuvali.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/41633082111.pdfIn PDF document text
    • http://maxbrio.kr/files/files/nujer.pdfIn PDF document text
    • http://arcadia-fitness.es/userfiles/file/9078402125.pdfIn PDF document text
    • https://tradegateindia.com/userfiles/file/vawexanolulilunekolife.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/12879769702.pdfIn PDF document text
    • http://vanguardhungary.hu/userfiles/file/pexofinubo.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/70822065926.pdfIn PDF document text
    • http://tyros-club.de/userfiles/file/bilesawujikawipete.pdfIn PDF document text
    • https://unaizahic.com/Files/files/weridasifupit.pdfIn PDF document text
    • http://pzhjintai.com/upload/files/14713982888.pdfIn PDF document text
    • http://gmkms.net/upfile_editor/2021/files/fedusimedumipisevopokowo.pdfIn PDF document text
    • https://gulfsupremesa.com/ckfinder/userfiles/files/lunosesi.pdfIn PDF document text
    • https://praktijk.zorglink.nl/ckfinder/userfiles/files/71679220248.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=download+goat+simulator+mmo+freePDF 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_off0000d1e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1E1 10884 bytes
SHA-256: 24466b01acce539540bd162eb084495715d024ec836e14a60be7168d63fa5539
font_01_sfnt_off0000eae5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000102f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F7 16656 bytes
SHA-256: 3a793e1c58961921d5e19691ad16531812d3f91ffbd9806e65e6f989ea82353f