Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a3a6add3a8c30bd…

MALICIOUS

PDF

97.8 KB Created: 2021-08-31 20:00:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 515ee38e277adf0db4bc05ff2dc03558 SHA-1: 32015506e74e517b421279efdbc98a8335b4cd33 SHA-256: 9a3a6add3a8c30bdadd3c6665ef79b56532e9cc6161f4a3425c99cc841ead2d0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links pointing to compromised websites, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the link farm and the presence of external URIs suggest a potential for JavaScript execution or redirection to malicious sites.

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://ldbell1965.net/clients/85689/File/fokozejuwurinopoziruj.pdf
    • https://www.jakketoes.be/ckfinder/userfiles/files/fuwidinekakaraligij.pdf
    • https://fablab808.com/nbloom/fckuploads/file/97238527669.pdf
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/8bc27b16d09fd70c6a00184a2c603a10/29671787811.pdf
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/fa383065ac328714f7594b44169186ba/15723711455.pdf
    • http://yuqiaohome.com/uploads/files/202108252137154952.pdf
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c8769e70546---fibowuwufapimawedis.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160963faf7a5c4---84397267597.pdf
    • http://afslab.asia/upload/files/bezasefavemukobumiga.pdf
    • https://www.spitalmoldovanoua.ro/ckfinder/userfiles/files/67571366250.pdf
    • http://phutungquanghieu.com/app/webroot/files/ckfinder/files/kotaganipa.pdf
    • http://nissanotogovap.net/uploads/images/files/bovogivenorovi.pdf
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/j10708b87bc4fjj1db3l51h003/57171225857.pdf
    • https://thietbidienmanhcuong.com/upload/files/50901789664.pdf
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/9fq1b7tpgsmfcgji4d82t1pu1d/pesuxuxufetubuxusop.pdf
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160c953d231846---58218419030.pdf
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/b5696a15adaeabcbb7aabf0096cac1a9/74062829334.pdf
    • http://hcwan.com/userfiles/file/19150865323.pdf
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/b81be983ba4c4ffc302c74ce345d3b5f/69285194572.pdf
    • http://appartenvue.net/appart/upload/images/zipirusubuv.pdf
    • http://xn--9w3b270a7kf.kr/ckfinder/userfiles/files/81438681249.pdf
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160904d809d987---datinukuzarenamukak.pdf
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/ed6d4a20231a0ea006cc37056dcf15ed/32949090622.pdf
    • http://njuhome.pl/ckfinder/userfiles/files/45655559363.pdf
    • https://pet-fashion.ro/mm/file/juvibasoxo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=financial+management+multiple+choice+questions+and+answers+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_off00011795.bin
c8ad17424151b210d6b337aa2cac11b8044950d2d4e170d4c780f551ba46493f
pdf-font-stream PDF embedded font (sfnt) at offset 0x11795 17980 bytes
font_01_sfnt_off0001460e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1460E 16792 bytes
font_02_sfnt_off00015e25.bin
c2364b06a52699ef1c08dd2664ee505e61fc6bf8d6151ff8dc4ea31285a0973f
pdf-font-stream PDF embedded font (sfnt) at offset 0x15E25 11376 bytes