Malicious PDF — malware analysis report

Static analysis result for SHA-256 acda7b8201b01f19…

MALICIOUS

PDF

85.0 KB Created: 2021-06-28 17:04:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: d25b44a857eeee2b97135e0bf498d79d SHA-1: bcdd775476dfaa2bfa91694bfee82a79058587ab SHA-256: acda7b8201b01f1968c24577238c76deacb1a9c25362da4f27edebcf51776875
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The embedded URLs, while some are marked benign, are part of a larger pattern of potentially harmful redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/6105d9d17869c51358dd3215eadff464/zanififav.pdf In PDF document text
    • http://atthaya.com/file_media/file_image/file/8480426246.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/bamereje.pdfIn PDF document text
    • http://fertilizerproductionprocess.com/d/files/64053649749.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/dbt9u6gqecirh877i1vmr7da24/88327691860.pdfIn PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/99252859074.pdfIn PDF document text
    • http://prestopc.it/upload/file/94626898765.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076e65b9344c---jejid.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/vetegu.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097b23f98037---63030895642.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/chg12tiqrdraftut6d472ilsl8/65937711747.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608d41df6d62f---36154534847.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080da593658e---71087692297.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/95566965793.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/70934622082.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/4c6974c3d1ded8a1d941eec2a691db0d/bozojorusoxajedemuruzal.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c04c7f9c17f---86765849258.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-5-13/20210513002221621942.pdfIn PDF document text
    • http://champaigncursillo.com/userfiles/file/67459248012.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/48983304637.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c77e0b33e7---60265685470.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/dvpvo0n29c1vc2b0f7j1igbjpp/41656777848.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/a62852e78dfaa9db09b89e0bcbdb25c6/89199146938.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/85274723434.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/bipmpctj4403fisfoj1vbk4nj7/tifedexonazefogepivo.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160a82a3c5fb62---mebogisisewaxetufarekeroz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=harry+potter+one+directionPDF 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_off0000e9bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BF 10400 bytes
SHA-256: 85762b602995ef65b2088f7cdfa3ad3dcfe5f97045d91d36b34689c25e638d92
font_01_sfnt_off00010159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10159 17384 bytes
SHA-256: 3aa3c1479f6a6eab13cb9a95958fd921e286dba2bf5d7950647ad5e879ebfebd
font_02_sfnt_off00012e8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1