Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a8f715e0523d298…

MALICIOUS

PDF

103.6 KB Created: 2021-07-04 04:07:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: c92d24206383f7d551a9dcc7fdf735fb SHA-1: 2cb10a60935c0a658445e88f35ddf3f6e9fcb8df SHA-256: 9a8f715e0523d29843dc2429d11b739cfc3d17df07f1434ef758a66466728095
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to various websites, many of which are hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it functions as a link farm to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9790

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://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c66477e528e---sesikotijilunutodo.pdf In PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160945eff22654---wudodigefasufoter.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/h383k20hcasbsfk2sgeoq1gm7r/rovijebokezoma.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/udju07vlckf2r8hgdira8md6s5/tewanojowufekitozo.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/tuxutusomafofiverakajijiw.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bc73202fe13---zakebigasalulok.pdfIn PDF document text
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/878e77ed199e687abd25a92cb391554c/zujivanizamir.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a249c0472a0---dovumaxusogivupopabulitu.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a15aab6ab1e---71877189354.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/5e3nj88iso3bolat8g13fo4em1/duvotenowetosa.pdfIn PDF document text
    • https://vanrun-it.nl/userfiles/files/78788764206.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/352b9dc040de3dfd6c9034e2f345b8f1/63286560335.pdfIn PDF document text
    • https://betenagro.com/sites/default/files/file/vofevubefegabepapasumi.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/hq2v4sccfv74i10t54pruqkhal/pametup.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/a6a2ed1f15689d3226535afd06f7a02b/bekozeneziwejatobeminol.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac721cae35b---17996917367.pdfIn PDF document text
    • https://mfdesign.hu/files/file/40352421421.pdfIn PDF document text
    • https://shriayurvednagpur.org/public/ckfinder/userfiles/files/guralivakikipokufulu.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/b605e2182082b4dff3a2788f99a20bf5/97008228071.pdfIn PDF document text
    • https://afayl.com/userfiles/file/gapuwipoladitokuvim.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210523025624.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160ac86d24a1cc---4543419307.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/cff037f7f3a96fb6d0e0b1b234c805a6/27400760493.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bad1c3218dd---nivuropor.pdfIn PDF document text
    • http://mamtomchabahai.com/uploads/files/files/gomeko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=how+long+does+it+take+to+complete+bachelor%27s+degreePDF link annotation
    • http://e1pl2.nazwa.pl/busy/fotki/file/82540074872.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_off00012d7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D7E 18076 bytes
SHA-256: 1062e4560ff95a78fc867873923bdd80c4731c8af830eb4a28ae5ea696541f7d
font_01_sfnt_off00015c97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C97 11304 bytes
SHA-256: fc726775f160fac71fa99353ef3a5a0043540a510cd07ffa2976a22afc542181
font_02_sfnt_off00017695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17695 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1