Malicious PDF — malware analysis report

Static analysis result for SHA-256 24c38b2265cfd22b…

MALICIOUS

PDF

99.1 KB Created: 2021-07-01 11:29:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 6bb81a0535e41b0c2c68ec645af72110 SHA-1: eccc5bdd6566eff3e62822c1be7e2658d6449a55 SHA-256: 24c38b2265cfd22bb92b78715cbc7bbec43211414823adb63a425394ef388266
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many hosted on compromised or disposable domains, indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to direct users to phishing sites or download further malware. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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 http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/vokizikutudedo.pdf In PDF document text
    • http://zonweringbelgie.com/ckfinder/userfiles/files/24301660325.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/zorurokatid.pdfIn PDF document text
    • https://www.tanyadantus.com/wp-content/plugins/super-forms/uploads/php/files/1fc568c2156f30a274f3a3403727b207/suxub.pdfIn PDF document text
    • http://snotlicker.com/clients/10243/File/27078372166.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160ae9fa25721c---32299813848.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/k96fphkr8g26m5hhcfo1tdlj6j/kuvusoduwam.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608b34e281506---4283679760.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/xewoterogub.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/557466cc10e049757045352152804920/nosujinubopa.pdfIn PDF document text
    • https://hijaulumut.com/contents//files/26339876254.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f5044659a---53629849338.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16084e7af41183---77960941314.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ded7543dc1---65903181717.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/5202e75c7f770b5f2ad6f09db8d4e49a/85528382333.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e3812c209---zixelasujabakubegiw.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/8a7e37b985119cd995a2e632e54d63b2/27815584295.pdfIn PDF document text
    • http://shopsuathientu.com/uploads/userfiles/file/rixefulelidoje.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a46efead5ed---71320411654.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079ed804e0a0---jibaj.pdfIn PDF document text
    • http://jlm-kg.com/uploads/file/79167699377.pdfIn PDF document text
    • http://apartmaji-zunicmile.com/uporabnik/file/35424843306.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/xevidadobaselitijiwofum.pdfIn PDF document text
    • http://www.rpv-drachten.nl/files/file/sapitezunejemilig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=view+pdf+in+browser+androidPDF 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_off00011e95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E95 18204 bytes
SHA-256: 4fb62b0e001ae3340efd28579b0b98eea5e8d2bdc98a1af9d43058888d299240
font_01_sfnt_off00014f0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F0D 10540 bytes
SHA-256: 88e40cf4c64328ae9471f9c1d2f31a54c0ade6960471750e06463f041425ce64
font_02_sfnt_off00016705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16705 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1