Malicious PDF — malware analysis report

Static analysis result for SHA-256 679cf105d56e288d…

MALICIOUS

PDF

79.9 KB Created: 2021-07-02 03:53:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c311352b365dae1636730bc510e9b4e1 SHA-1: 360aec14e1736d9abb61105498f6758d942dd408 SHA-256: 679cf105d56e288d730d8555b25dbe0dc921d7e87e710e5cea79a8b192e78513
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable hosting domains, indicating a link farm designed to lead users to malicious content. ClamAV and ML classifiers strongly indicate this PDF is malicious, likely a phishing or trojan delivery mechanism. The presence of external URI links and compromised CMS uploads suggests an attempt to exploit user trust or leverage vulnerable web infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

Heuristics 6

  • 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.
  • 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://aldo-ins.com/userfiles/file/42494077650.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b67d77c8f4---gimotomimenuveraxon.pdf
    • http://thsport.dk/ckfinder/userfiles/files/kurojinetufuzalojutin.pdf
    • https://seikico.net/img-tym/files/33140101561.pdf
    • http://nebovsem.ru/app/webroot/files/files/23207743543.pdf
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/itsoqnau10cg4sk294fggg71sh/31453196174.pdf
    • http://masonfamilyreunion.org/clients/b/bd/bdaf0a3c19eb5f10f0519c747c117e37/File/18570891412.pdf
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa7a29204d8---dosujeviwusevutazobid.pdf
    • http://hndgyl.com/v15/Upload/file/20217118328614.pdf
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/1ebb87973270383a061b0331f4bd9dc4/tolaxirawemanigos.pdf
    • http://aksaaydinlatma.com/img/editor/image/file/56923366334.pdf
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/708b9539df7b492aaa56eecfe10e7f77/gilenenagukodadapexuri.pdf
    • http://hilltop1976.com/clients/24685/File/rafaxanuraluvepoka.pdf
    • https://blugarden.eu/file/satar.pdf
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/ad281e97da500c6d2c580d0ad53347f2/wedogobupun.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/697200539d9153289f9281a29a254aff/65699537540.pdf
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd51e1d54c---2909578120.pdf
    • http://chonburi33.com/userfiles/file/98489836121.pdf
    • http://roocenter.ru/upload/file/91888973237.pdf
    • http://atek-ent.com/upload/file/jewejivizewunu.pdf
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb2a304fea1---58198584616.pdf
    • http://boothbayharborshipyard.com/userfiles/file/welezapotat.pdf
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f9a27a288b---vemekivomuxelajodu.pdf
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/gepunufibevonovegelesiw.pdf
    • http://learningkey.org/userfiles/88090429868.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=the+somebody+break+your+heart
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c467.bin
d1b3b2e56e2024723110510c6f17b45558a956de0f9b9fa6fcdd21fd3de5815f
pdf-font-stream PDF embedded font (sfnt) at offset 0xC467 22224 bytes
font_01_sfnt_off0000f798.bin
15171638d69c9281a983de8a04f8d213e5ed86d33053034f6aa0dd130c4010d8
pdf-font-stream PDF embedded font (sfnt) at offset 0xF798 1700 bytes
font_02_sfnt_off0000ffb0.bin
d540bce6ac71dff19f8d1e01ca0fad2aa7f694fa1816900d404fa7f7abc6c59d
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB0 10680 bytes
font_03_sfnt_off00011845.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11845 16792 bytes