Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cb27c363e23d62a…

MALICIOUS

PDF

116.8 KB Created: 2021-08-16 02:07:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a25cc7c7001666beed812383cb70a596 SHA-1: 750bc76bf14818e46ca5c6821cd6af67fc0f0a3d SHA-256: 6cb27c363e23d62a7d0efefd5e959b927798cb735e66231d2c0c10cd965a296f
176 Risk Score

Malware Insights

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

The PDF contains numerous embedded URIs that point to various websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious content or phishing pages. No scripts were extracted, but the structure and URI patterns are indicative of a malicious PDF designed for initial access via phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/16113640a64c8f---kuketuxivezuwed.pdf In PDF document text
    • http://jysfh.com/upload_fck/file/2021-8-9/20210809082744945686.pdfIn PDF document text
    • https://prcomponents.com/ckfinder/userfiles/files/9612963441.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/cs4jv4ultqsuhp7kfhk6obvu6n/83673305531.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/16772467098.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1611169edc4333---98415170790.pdfPDF link annotation
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/6uf1dgifdgei61mcroguvhe411/90798646509.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/tuxazog.pdfIn PDF document text
    • http://dep14kirov.ru/userfiles/file/tomigida.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa21e6c43e3---jidovodozo.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/18406458281.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c867d2d3f16---mozibutezawabe.pdfIn PDF document text
    • http://e-cluny.cz/UserFiles/file/resonaguwulabax.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b87abfca240---fimorotigowid.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/f0et5uu2f44sm3oahut0b775jh/bogimusiduzegugo.pdfIn PDF document text
    • https://industriameccanica.it/file/wukajemexiratufonawavuj.pdfIn PDF document text
    • https://wittnebel.dk/file/22555504109.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bb03bb5a126---fefiz.pdfIn PDF document text
    • http://naturabliskociebie.pl/userfiles/file/80036900302.pdfIn PDF document text
    • https://akproauto.net/nbloom/fckuploads/file/44737462438.pdfIn PDF document text
    • https://ibextrail.com/editor-images/64931226235.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607612c8c37f9---zubafudagazaxigotuzewisa.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1610ef59b74814---32547344611.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=mantas+tejidas+a+crochet+para+bebes+paso+a+pasoPDF 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_off000165c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x165C1 18296 bytes
SHA-256: 90367606fad6830bd92f6da49207c0799e516798daf428f0279f530710654bb0
font_01_sfnt_off00019442.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19442 10828 bytes
SHA-256: a582185f63f44c7942b288a4aedba52cf21483332740173f57394e8ec26fc03b
font_02_sfnt_off0001ace8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ACE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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