Malicious PDF — malware analysis report

Static analysis result for SHA-256 5502b66c616e885a…

MALICIOUS

PDF

80.2 KB Created: 2021-09-01 01:20:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c908f9a067acdad9a9ed969c7cf0068c SHA-1: 20d65d79414678a99fd2eb0df006ff095429133a SHA-256: 5502b66c616e885aab373fd5a4f05d591bc1ffd370896d8ecab35357d9ff234d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed for SEO manipulation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links. The embedded JavaScript could be used to further obfuscate the redirection or deliver a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://balassalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/20379669248.pdf
    • http://morard-mcf.fr/data/Files/71216795720.pdf
    • http://ingmontagna.com/userfiles/files/46762319214.pdf
    • http://cuacuonnhaxuongbinhduong.com/upload/files/lofez.pdf
    • http://veivel.com/userfiles/file/biwefafanunutodepuneniw.pdf
    • http://residencelesaline.it/userfiles/files/jadupo.pdf
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160806b5f1610a---rakegusawef.pdf
    • http://otczenacts.com/media/files/bewemerogepukovesapamewe.pdf
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/2q2khmllf0dcmlpkljecpfn52i/zapeguvadadetedisalufalum.pdf
    • http://www.saveurspoitoucharentes.com/admin/ckfinder/userfiles/files/javulenukaxonevux.pdf
    • https://franchise-vietnam.com/app/webroot/img/files/68158475152.pdf
    • http://buddhavehicle.com/userfiles/file/85180735300.pdf
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084b8c630a38---30477113133.pdf
    • http://ahkjt.com/upfile/file/26900421523.pdf
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/16091a0068643a---80120586309.pdf
    • https://projectmine.hu/ckfinder/userfiles/files/petefagirulexu.pdf
    • http://nuitsdartistes.eu/images/file/dovudabusolez.pdf
    • http://spc1991.com/ckfinder/userfiles/files/34411372976.pdf
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/bh8u0dhaebu2rt66a76vvo43ci/zifovegola.pdf
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/a212d1e60a744ce05876f81787d4cec5/74362912128.pdf
    • https://chatsystem.site/js/ckfinder/userfiles/files/19445319774.pdf
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/b3d8ce3b6da90cf66dc15d4527e7b8f7/xidus.pdf
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/28afa23182cd94096d375cc3e49b09a3/kakorabije.pdf
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160c4716cf1eb5---labutupivuxukeweniwuxurit.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=highest+grossing+hollywood+movies+2020
    • 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_off0000d267.bin
b2a9903483879cd253984a4726c4c1aabc21059bd408ce6eb8d39a714c2951ac
pdf-font-stream PDF embedded font (sfnt) at offset 0xD267 11032 bytes
font_01_sfnt_off0000ebb9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB9 16792 bytes
font_02_sfnt_off000103cb.bin
4584c08283f14c76eb86092f0a3a0f04b4ff101bfde5eda880217f408f8ece76
pdf-font-stream PDF embedded font (sfnt) at offset 0x103CB 18048 bytes