Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac2a1d2a1d240c4a…

MALICIOUS

PDF

68.6 KB Created: 2021-09-25 06:56:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 083fb1503d482569ff4bb4271b3e9d21 SHA-1: e0b6a0fbf7d7bbd5be5bc8a6ad77d5928825cbfc SHA-256: ac2a1d2a1d240c4a8afed0ae650cd763441cc23dd500e8c29dc78b3d81369d24
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to a variety of domains, many of which appear to be disposable or compromised, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://catamma.ru/uplcv?utm_term=bar+pendulum+diagram PDF link annotation
    • http://sirinthepgroup.com/userfiles/file/64175651903.pdfIn PDF document text
    • http://www.nena-artspace.com/ckfinder/userfiles/files/22366657391.pdfIn PDF document text
    • http://baoveantam.org/upload/files/47632290254.pdfIn PDF document text
    • http://optykglowacki.pl/obrazki/files/vakujigexaresop.pdfIn PDF document text
    • http://www.pilartangguh.com/file/24887867173.pdfIn PDF document text
    • http://jingmingtai.com/filespath/files/20210910040111.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/099ceadca23ca6a13338f7bb4987baa0/regivebeboroluvojoreduxa.pdfIn PDF document text
    • https://shinko-tw.com/UserFiles/file/29803902222.pdfIn PDF document text
    • http://xn--80aaaghhaztbcd1agjgbccsgfftf.xn--p1ai/pict/file/9767655856.pdfIn PDF document text
    • http://pbpharm.com/upload/files/92684399725.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/depimov.pdfIn PDF document text
    • http://nepodoshlo.kz/ckfinder/userfiles/files/98322251693.pdfIn PDF document text
    • https://archicakedesign.com/upload/file/47792901833.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161378ab2dc3e2---tegexok.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/venalugap.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c5ebe86c88---73859682735.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/53322546414.pdfIn PDF document text
    • http://tagsu.com/attachments/fckattachments/file/mikutidizuv.pdfIn PDF document text
    • http://philipsphotographystudio.com/80890565872.pdfIn PDF document text
    • https://dcimx.com/files/43905245400.pdfIn PDF document text
    • https://emenu.hu/editor_up/32959838437.pdfIn PDF document text
    • http://anindecor.pl/files/file/lanixerom.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_off0000adfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC613 10504 bytes
SHA-256: fa6df379f90eed7c5b2227d0c65e025c1e22bb8441972bd6653aeb61f3cdf2d0
font_02_sfnt_off0000dd9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD9F 15640 bytes
SHA-256: ce12a122f45b2cdaa2b0d9bcb3a6d9a70373e30d6859b42c02590c87a55faad5