Malicious PDF — malware analysis report

Static analysis result for SHA-256 80015b4368de5ae5…

MALICIOUS

PDF

90.3 KB Created: 2021-08-08 03:04:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 14c6759ec34552c77e93d6b98ffeb8ea SHA-1: f924dc8c19bcb77359b169ecbb42fcc660b1bc18 SHA-256: 80015b4368de5ae5259adc65fad1c36f3478856baaf406dc3c4461108b66fd38
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised websites, many of which host further PDF files. This structure suggests the primary purpose is to redirect users to malicious content, likely for phishing or malware distribution. ClamAV detection and ML classification strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

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://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/65041cf002b610f3a873f8070dc459ef/35561380929.pdf In PDF document text
    • http://reicar.dk/userfiles/file/77048933434.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160e172e00231b---27716553206.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/fupolidewul.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/b09021f2084f55f1675e19ea5c2df87f/90638406441.pdfIn PDF document text
    • https://kurek-rowery.pl/user_pict/file/82681185897.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087375773f70---xexurikamub.pdfIn PDF document text
    • https://biovuspharma.net/userfiles/files/65862943638.pdfIn PDF document text
    • http://agenziaimmobiliarecannavo.eu/userfiles/files/85571493514.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/cf573104461a12ac8da97c6a9d7df147/tamom.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/a4bo0beo0s6u405acct2lboud2/kufuriwekotusumikavix.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/7d3534d934f48e822ef7b55a84d1d816/varufino.pdfIn PDF document text
    • https://call-life.com/ckfinder/userfiles/files/fevaniwap.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609887ceb724b---nemixeta.pdfIn PDF document text
    • http://asr-net.ru/uploads/files/80617786576.pdfIn PDF document text
    • http://ketoanaca.com/uploads/image/files/25604075851.pdfIn PDF document text
    • https://zionapostolicministries.org/uploads/files/sovub.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/27f42b9djbbjg5jpv16lk6o1d1/ligesusesu.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/rirojilalatemar.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/li2t94q4tdvrquf1i4b5j7crb0/86660645408.pdfIn PDF document text
    • http://chia4kids.ru/ckfinder/userfiles/files/bodupomig.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/7cc82cb0f35b31473ccd89a59b61ddf7/wakilaronejokukid.pdfIn PDF document text
    • http://mmt24.ru/files/file/delajudibimubekaso.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/5bb21d2ce9fd3af554ceba891481009a/kerabexitirenosoroladiguv.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/d650b21ee641254d3904860a205c8212/paralivinitobe.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/63qpuiar6jho8btqu9tmjvoig9/sokukusiwulemubipuru.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/gjjdoc3bcgvjvcd5q95d1fe0m3/28517956150.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=what+is+the+meaning+of+p+c+o+sPDF 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_off0000feb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB0 10776 bytes
SHA-256: 1224f3768922e255fb126b95636cf7e9ada0e0df021f0d8ff0bff7fc8081c941
font_01_sfnt_off0001175e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1175E 16212 bytes
SHA-256: 38332f7e01e061fef88af877f00cf133cac437bcfcba68d7cf18ea474b297660
font_02_sfnt_off0001413d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1413D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1