Malicious PDF — malware analysis report

Static analysis result for SHA-256 e73e1334617cb3e2…

MALICIOUS

PDF

98.5 KB Created: 2021-08-13 21:10:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6982ea5045874bdfdc261a4873bd04b2 SHA-1: ce68c2c616a1b594e8f9bb494fdc475ab4276d11 SHA-256: e73e1334617cb3e20c93e90e0901f3f560f4b2bc0c715a4a068518242386303f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites used for hosting PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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 http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a2852f95414---52873779201.pdf In PDF document text
    • https://zestus.us/admin/images/file/19036294644.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/e1b6e07de304b1ab9710492cf5ff2848/baxinaleriwizowexeb.pdfIn PDF document text
    • https://graveyards-fuj.ae/userfiles/files/68667788298.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/e5ba7bb8272108446fe69b52d7511d90/70336980165.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/nomlpsssnq99gdngjgm747qgh3/19330978948.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/5707a74179cba52d937f533fca940906/munolebabijajuz.pdfIn PDF document text
    • https://erdemlerkoleji.com/resimler/files/3829267690.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/311f519f74fbcb5c1e2cfa67eee595e2/lipugobifi.pdfIn PDF document text
    • https://hongming-eco.com/userfiles/file/xotopesox.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/bc0a0aba04c058f9bb131795c6467a54/68521522405.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/19b235b255f65f2448f110534b34e235/fuposizivujiwelefiwemage.pdfIn PDF document text
    • http://suttonoakfarms.com/clients/880813/File/95005319523.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/jixelizuvatalamufulonezel.pdfIn PDF document text
    • http://m-styleauto.com/js/upload/files/kiseboborigatobemekipa.pdfIn PDF document text
    • https://infotechsystemsonline.com/ital/www/img/file/golabavirulep.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/vefujabug.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce818aeb6bf---32058876306.pdfIn PDF document text
    • https://automatisme-portail-bordazzi.fr/fichiers/nibitimudasutojuporo.pdfIn PDF document text
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1607099decd5d7---pokofe.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609844a5a5012---68136727310.pdfIn PDF document text
    • https://groupburuemas1.com/contents//files/45563185881.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160906af63207b---88315013394.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a42b1d9a742---rosemubale.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/aae6814976be685886f3a99886cb66c7/zexemaxidifoki.pdfIn PDF document text
    • https://marjoyunlar.com/calisma2/files/uploads/suvefebemafiz.pdfIn PDF document text
    • http://maybomchuachay24h.com/Images_upload/files/19239087476.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=what+do+you+need+to+start+your+own+food+truck+businessPDF 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_off00011c3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C3D 17220 bytes
SHA-256: fae097237a3f5617a0efa6a7a81e7f50ad6112f803f8bd15db4dd4fd4976d36e
font_01_sfnt_off00014984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14984 11052 bytes
SHA-256: c401d38fa8a8e23134c194285cd0207771d689bcd3e362dad7365b5fed871d42
font_02_sfnt_off00016349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16349 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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