Malicious PDF — malware analysis report

Static analysis result for SHA-256 afd4717d57fc208d…

MALICIOUS

PDF

82.4 KB Created: 2021-08-21 02:44:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 79da093faca381ae8fc0306cf007a595 SHA-1: 92820121a89638eea30e0d8b17019ca82703f110 SHA-256: afd4717d57fc208d099d33ab81dd8bfe41560f58bfa49e321f1334dd7267635d
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to external resources, some of which are hosted on compromised WordPress sites. The primary purpose appears to be directing users to potentially malicious content through these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 http://alexandraharris.com/clients/36054/File/67913943908.pdf In PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/3tqtibg7qed4gl5rrusebnflt6/48475306878.pdfIn PDF document text
    • http://volamtuyetthe.com/userfiles/file/siwomagirifafepaxaluxobi.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/5qg55a6vg2vmjaqla4v0gcvpt0/wotogixakejilajesowaduroz.pdfIn PDF document text
    • https://htapigroup3.com/contents//files/69846161687.pdfIn PDF document text
    • http://bsinteriordesigner.com/userfiles/files/57582769250.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160bf20b240bac---11937146012.pdfIn PDF document text
    • http://tentimesneedlehill.com/UPFILE/userfiles/files/wuziveli.pdfIn PDF document text
    • http://www.alcera.ca/userfiles/file/44106099081.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16097e91a89b3e---38588691698.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f62ec232c4---safonebupepaw.pdfIn PDF document text
    • https://valubil.com/public/uploads/cms_file/cms_files/32137117843.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/3d1698b7d70244c25835e38a9992a2aa/46366019615.pdfIn PDF document text
    • http://italianopizzeria-pg.com/uploads/files/gipederutanejuvonepipopu.pdfIn PDF document text
    • https://xn--bren-mgenwil-gcbf.ch/sites/default/files/fck-uploads/file/45111271049.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/b2aa90c52191300f4e82ca5baa545ba7/muvozixukogetusivajebal.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/ec7b96a62fc4efefe0a855cd901fa8ff/40979658684.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/ab7f2670f349f6962777c8736dafef49/wijofexive.pdfIn PDF document text
    • https://organicfertilizerproduction.com/d/files/mitonulojegoziziki.pdfIn PDF document text
    • http://galluccifaibano.com/userfiles/file/77028187748.pdfIn PDF document text
    • http://controlsystemco.com/cache/fck_files/file/49349589852.pdfIn PDF document text
    • http://gongotour.com/FileData/ckfinder/files/20210705_CDECF5F7F145DBAA.pdfIn PDF document text
    • http://lapawan15.com/shop/fck_file/file/sikumilezew.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd7ce2a75cd---85596679882.pdfIn PDF document text
    • http://alexanderkanevskyartgallery.com/clientMedia/file/17725930227.pdfIn PDF document text
    • https://sjamsul-hidajat.id/ck_uploads/uploads/files/97309888139.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=porque+se+seca+la+lengua+y+el+paladarPDF 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_off0000dd45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD45 17336 bytes
SHA-256: c774d01ca4c45f6f72993cf2790a1045b1aa8f589bf6951ba1bb12b58a76ffc8
font_01_sfnt_off0001093e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1093E 10860 bytes
SHA-256: 8866dad9bdc2917404b22ade50f4fcd3bb464ce302ed53402d3a42f90b8011f1
font_02_sfnt_off000121fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1