Malicious PDF — malware analysis report

Static analysis result for SHA-256 aacd50c7f518cd82…

MALICIOUS

PDF

82.9 KB Created: 2021-09-17 09:05:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 46ad6cb530094f7525e3fa54527b500b SHA-1: 57c360428b251e9e5d9ebceef1fc4a2d7c767255 SHA-256: aacd50c7f518cd822a33f6504d961bde768ee4fb6f0c1f5ce09366e1fcf4412a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress uploads or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://cructi.ru/uplcv?utm_term=where+to+find+mac+address+on+android PDF link annotation
    • http://prime-standard.com/piceditor/file/diporofozeku.pdfIn PDF document text
    • http://archpiudue.com/userfiles/files/loniziwebuvop.pdfIn PDF document text
    • http://remont-etalon.ru/upload/files/xuxewowejufizopezomex.pdfIn PDF document text
    • https://ever.dacola.com/upload/files/tobixobop.pdfIn PDF document text
    • https://kochitaxirental.com/ckfinder/userfiles/files/57296103569.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613d07bc37b63---tofawolisaga.pdfIn PDF document text
    • http://babamoleskine.com/files/file/25729235046.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/99402203483.pdfIn PDF document text
    • https://proxkimya.com/resimler/files/peresubu.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/xodiwatemigigoxunux.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16133ce8b052e7---pekojibugonano.pdfIn PDF document text
    • http://applecentervn.com/uploads/image/files/21913134648.pdfIn PDF document text
    • http://buyyoutubelikes.com/ci/userfiles/files/zagik.pdfIn PDF document text
    • https://mujeresenmovimientoplus.com/userfiles/file/58330056859.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16133cb05ee2ca---18579880218.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/begovu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143e1fcbcc2f---dizekujewalexezotoxeve.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/wevemodapesodowuba.pdfIn PDF document text
    • https://ist-lb1.istanajp.com/contents/files/9402617306.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/61699489126.pdfIn PDF document text
    • http://biogenetec.tw/image/files/20210903_035540.pdfIn PDF document text
    • http://avanti.pl/userfiles/file/55266637954.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_off0000dbc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC9 10688 bytes
SHA-256: 01c3e0ac291ea869cc107712711b8af6a153c5cfee450d53a0bbe45fe088ba1d
font_01_sfnt_off0000f426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF426 19064 bytes
SHA-256: 1365c2115392d86d7ad7a85ca73acf70be4f30dfcd74f1d183529bb8d2ddd5c7
font_02_sfnt_off000125b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1