Malicious PDF — malware analysis report

Static analysis result for SHA-256 91707abb8c6dde17…

MALICIOUS

PDF

88.3 KB Created: 2021-08-01 01:58:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2fd7e261f9373e32ef2ccec68e20194f SHA-1: 3bd9a51a09e9db6101e0146b301b288e0376befb SHA-256: 91707abb8c6dde1765c11ff63e8984476b0fcda6baf19d3119cc7fea9345397b
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's used to distribute further malicious content or phish users. The PDF structure itself is not inherently malicious, but its purpose is to redirect users to external, potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://nestaerospace.com/uploads/file/88689399056.pdf In PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/omflnpvkpsb3cm03q3ieepgr4d/3853537591.pdfIn PDF document text
    • https://peterdegendt.be/file/64637861635.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16090938e0e29a---60229808649.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/mepemotugiwotorevoxeki.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c84f7d2c83---bejedatafiladobimak.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cec0e5f12a2---poridazoxofa.pdfIn PDF document text
    • http://allasclub.com/campannas/file/61394664500.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/85fqvd2jbbt97jii230jp6o0s0/rofexodobirur.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/39669839801.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/00k5jbq4mirufqn687tva41slc/baronisewefiti.pdfIn PDF document text
    • http://helloslow.com/data/userfiles/files/lonikudakugetifunonone.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/fbfb106af38d9bdef77b04f7afafe2fd/99658105543.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/7nl3hkm6rnbba17faujml10tl8/keparid.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/47573505990.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/d910af3d97f7d05b18942493f7a5fffb/8187863911.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/vikinipakefemepopido.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/11160429981.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/2e1bed77b193d8c30e0a4f288d853bf5/11134695909.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/0cdf9806ac90520d205f63a9d7fab004/xuwemorebokejiker.pdfIn PDF document text
    • http://cornucopiafrederick.com/uploads/files/73767237180.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070c4c0cb0fb---tiluwekubepewirasar.pdfIn PDF document text
    • https://barcelonacentromedico.es/files/galeria/files/87504680654.pdfIn PDF document text
    • http://iziusb.com/userfiles//file/12496600464.pdfIn PDF document text
    • http://www.donboscovizag.org/images/files/kodimilorozefizeg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=paroles+du+chant+la+voici+la+nuit+de+dieuPDF 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_off0000efb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB2 10632 bytes
SHA-256: a4e5465aaf861ff8b78fda266eac5f267711268a5435adf8671044791b64e07c
font_01_sfnt_off000107fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001200e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1200E 20604 bytes
SHA-256: d32c81bbed802e9d754990a73fcb51574982b2a88a39cfd062bffa9dc7ea0ea0

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