Malicious PDF — malware analysis report

Static analysis result for SHA-256 87d14bef260f32b1…

MALICIOUS

PDF

135.7 KB Created: 2021-07-02 03:13:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 3bd0632b84333946de04f2e373fa9d69 SHA-1: 8e6d40ccfa3b64dd3252dcf4336d797d59ba8fd8 SHA-256: 87d14bef260f32b14f0ac30594fda32d779780ff4b7e259f7112a222d25004dd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9787

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://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/9iv7l2mjcegc46q9khcqn53ioo/28876628697.pdf In PDF document text
    • https://resulgame.com/calisma2/files/uploads/24004965196.pdfIn PDF document text
    • https://ms01bet.net/contents//files/xigiwazipokuxu.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/ruvijo.pdfIn PDF document text
    • http://casaalu.com/luutru/files/volebadaxibosinukot.pdfIn PDF document text
    • https://bharatbiodiesel.com/userfiles/file/jilezosogekororovosasagej.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8ac5b3d65---dusabaxejumekufikiru.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c636a0ae694---11798161711.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/zizaxugulobun.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/c78579pmratpqnt54km66vd6gu/najalikikefax.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/f122b5495d886d95cb3846f99524f429/81231910337.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/waxifomisufizofunov.pdfIn PDF document text
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/64963145602.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608450aa96188---11682474130.pdfIn PDF document text
    • https://pestresolution.pt/site/upload/file/jumazugun.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c11f04d56---15790973792.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160740dbde6efc---morazuporifetut.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/besikiko.pdfIn PDF document text
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/8eafa9668aec60a17a8dd2a0c0f24a84/kifofogadakuxe.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094edcae53df---44293858288.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/ge75b31ehlmp6gvfo9d7qog8cg/7864556323.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/d06fab08445b7c58c2f6cbc3e503c2fb/wepuz.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608180cd726f2---43898787886.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=adonai+meaning+in+hebrewPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017444.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17444 24896 bytes
SHA-256: 1568a60ba67a64b94e7d90202f5a8c994b058cf3c75c0acb7b3b1a975af064e2
font_01_sfnt_off0001b365.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B365 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001cb7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CB7C 10588 bytes
SHA-256: 6eeaf9cae808a9989ccdf455140260c7a23b604d29a2159a940126ad200b64b4
font_03_sfnt_off0001e334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E334 23176 bytes
SHA-256: 553047a76765832e95c8d8bb970881b4f6dfb21f92cace58922415ee64e56b6a

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