Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0460d82b2c613eb…

MALICIOUS

PDF

74.6 KB Created: 2021-08-28 00:18:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8ca258ebe51f9a124744ce3807a70424 SHA-1: c5ea4fa5ca17307a6128764dba6e70558c14793f SHA-256: a0460d82b2c613eb4d1b504f7c3191f7265a2d65f1abfa61477ddffcfcf11583
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The PDF also features a link farm pointing to numerous distinct hosts, many of which appear to be compromised WordPress sites or disposable hosting, indicating a likely phishing or malware distribution campaign. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • 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 https://blagoustroystvo24.ru/ckfinder/userfiles/files/mifobunajibajomemopadaton.pdf In PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/46ccae4324a5259daaf89caedfe07b0c/18972635335.pdfIn PDF document text
    • http://khamtribacninh.com/images/files/61291442575.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/miwikanowepar.pdfIn PDF document text
    • http://pandoraecza.com/genelresimler/file/sadijujilarabawixatibanon.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af64753ee79---tuwunogedewibas.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/90857221596.pdfIn PDF document text
    • https://chp-travel.ir/data/file/pewesifudugadegujegino.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb298e3d7ce---20826935883.pdfIn PDF document text
    • http://driscollandgibson.com/images/edit_images/file/61771398246.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1609e76b06822f---gakimuxemigovudij.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/3e464e03b8d78d73e128e74072be00b1/46185338351.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093038389ead---63253519666.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/2ea77215800ddec0bc69b4232f9e1f1e/gufoj.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/le0adqusks5bf73jht3cdp575g/69466059870.pdfIn PDF document text
    • https://prolocolidodisavio.org/ckfinder/userfiles/files/98844195870.pdfIn PDF document text
    • http://hotspot-usa.com/js/upload/files/38462083058.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/62779647854.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/sokojejiwakora.pdfIn PDF document text
    • https://tennis94.fr/img/pics/files/vazaso.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16102c711ec264---lobuwidowi.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/2232030837.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ca56c4c3b---daboludanapexufiduxixet.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/h9ffjcflj0e7bjv72mn0kilo1t/73241765331.pdfIn PDF document text
    • http://longarmquiltingacadamy.com/fckeditor/userfiles/file/ropapidapefo.pdfIn PDF document text
    • http://geoodwierty.pl/files/file/vixaminakufomujovos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+winterize+io+boat+motorPDF 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_off0000c640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC640 10332 bytes
SHA-256: 9aa6eb78f5a8ca678accb1649208281159c6d3047e1b7f5715ba0f76e55eba31
font_01_sfnt_off0000dd97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f5a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A9 15112 bytes
SHA-256: 4b7c883d355cc0aac6d02195123893b7504db060111d8724c0a03aa64f373abf