Malicious PDF — malware analysis report

Static analysis result for SHA-256 0886cf0a3d68e2b1…

MALICIOUS

PDF

71.8 KB Created: 2021-09-03 15:18:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b9fc25513de7c22b928b0f79ee201609 SHA-1: 3787db4ac20ccd2a37c753d5d195c181a4598fc8 SHA-256: 0886cf0a3d68e2b14c61dddfb80f3d550fc22096e3b6946e36983ee39f9db879
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The document's structure and URL patterns align with common tactics for initial access via malicious attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://inwebjor.ru/uplcv?utm_term=abrsm+grade+5+theory+past+papers+pdf+free PDF link annotation
    • https://garraldaarquitectura.com/garralda_userfiles/files/velak.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc8e61ed298---90727280187.pdfIn PDF document text
    • https://ymvii.com/admin/upload/files/91610601792.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/budawofojowipegew.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/2ffc48b895b36042a7b809bc67b6abc4/wexemefiwoputigaxikev.pdfIn PDF document text
    • http://scuderieverdina.it/scuderia/userfiles/file/31420227979.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/pf62acf3t2ljje8lv1kfq9nuuj/31490094157.pdfIn PDF document text
    • https://pacpartner.net/images_client//imagesfile/pufifedofes.pdfIn PDF document text
    • http://kammerchor-lindau.com/file/33884445184.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5155dba749---76548621791.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/zuvajekafid.pdfIn PDF document text
    • https://coolinterier.sk/upload/files/ruvojeva.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/ed5335441cb3ed8aa4654e1b1d19cfc2/fuvibito.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160774018a7368---42208946865.pdfIn PDF document text
    • https://kuzeyilac.com/resimler/files/najoranufazakowazorow.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/01c26c11679fa1386f088c754b989e8d/44202745851.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/n0r8eo0bb5dulgm2n5p2cijsts/77102757614.pdfIn PDF document text
    • http://chayka-svg.ru/files/gevedowi.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d345768ce---lopewetomite.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1f5397b253---85625302121.pdfIn PDF document text
    • http://nprofit.hk/userfiles/28217472583.pdfIn PDF document text
    • https://ipekyolumedya.com/resim_galeri/file/45291657410.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/rf1iru6h2ura8b3gk9n6661jjn/58842504902.pdfIn PDF document text
    • http://biosafety.biz/ckfinder/userfiles/files/36431551074.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/8213p3q4jml02aeh2g9c603hk0/rupafajake.pdfIn PDF document text
    • http://mpwlawpa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kotidavexufu.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_off0000b8e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8E2 15164 bytes
SHA-256: 089a3928a0e561ff2e34ee5e3c36c50808202016949785e24144e205e0586aba
font_01_sfnt_off0000df35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF35 11072 bytes
SHA-256: 47c638245b38602dc6c40d7273e861bdf9000da08e7908a3c994360f77194a64
font_02_sfnt_off0000f8c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1