Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dc213566a67d5f1…

MALICIOUS

PDF

76.2 KB Created: 2021-09-06 20:52:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0e8c486018e58d001073f2fc61718475 SHA-1: 4d95a7cb21734cb30618351a8124a8430208ffd9 SHA-256: 7dc213566a67d5f16a6b92c44d36522d3528ea6625bc94364318e0c3e0c154fe
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous external URIs and link farms pointing to various domains, suggesting an attempt to redirect users to malicious websites. The presence of these links and the overall detection indicate a likely phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://allytemp.ru/uplcv?utm_term=allergic+contact+dermatitis+pdf PDF link annotation
    • http://animalscipublisher.com/files/upfiles/file/83749292735.pdfIn PDF document text
    • http://apartament-krokus.pl/userfiles/file/96384477846.pdfIn PDF document text
    • https://zaragozadenoche.es/upload/files/80362407047.pdfIn PDF document text
    • http://www.johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/jivekenigevekaje.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/6a1ce71c1fd1fbedc1bfe6324e88ac9c/6550187406.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e6d3924691---27634017779.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d18ccefb1c---tinagonekarin.pdfIn PDF document text
    • http://ps-chiptuning.hu/userfiles/files/29712395500.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/45a0ac3bb13b3fee1c3ab577c58564f6/91830026568.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/74178460389.pdfIn PDF document text
    • http://lakehighlandsrw.org/clients/863582/File/gilixamekutefori.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/on8jaqj6cu4qdcnp7lqs40jq81/29680980691.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ecaadbd4951---46953178321.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c2fa4130872---wunamoji.pdfIn PDF document text
    • http://reklama-kemerovo.ru/files/files/pazowexakudo.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160718fa1047df---82959133163.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/399ec2ef0d3d18c65111adedf0b548da/xopivaxa.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/86580213100.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ab396d80d---favinufitixem.pdfIn PDF document text
    • https://traffictkt.com/viking1/uploads/files/16719030480.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/nuworixiliboredavew.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/01bf2690109725ec40e91518f3498026/noxem.pdfIn PDF document text
    • http://www.pvvc.cz/files/68199094626.pdfIn PDF document text
    • http://restokrat.info/userfiles/file/wemapejakuwu.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/d3b2445efa482a884c64fae3eda73e91/sonixegobanesan.pdfIn PDF document text
    • 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_off0000c8d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8D8 15992 bytes
SHA-256: cc62987234434d204e7b2a79c64449714f15fb2f8e1d698505c43b33877ff54c
font_01_sfnt_off0000f190.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF190 10944 bytes
SHA-256: adfa0ce24b65f23f0dbf69406f5f7dbfd555d2b26c7b8608fbe27b8bd74a5333
font_02_sfnt_off00010abe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ABE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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