Malicious PDF — malware analysis report

Static analysis result for SHA-256 081f075a3e4ff47d…

MALICIOUS

PDF

85.8 KB Created: 2021-08-29 23:48:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c2cb3a714e6d3ceb2314cb75158070a8 SHA-1: 959658c5be6f76f28b8a145fcbc5c08763bdbc6f SHA-256: 081f075a3e4ff47d4261f3fcd877bfec83915c18733e530575aa1061057818e2
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the structure and URL distribution suggest the document's primary purpose is to redirect users, potentially to phishing sites or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 5

  • 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://afghansolar.com/userfiles/file/rubawul.pdf In PDF document text
    • http://hifitness.hu/userfiles/file/49825838120.pdfIn PDF document text
    • http://sure2trips.com/bot/ckfinder/uf/files/timarexokesirajipe.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/40f706b82592e8f0d418ee3e273b604a/39300298607.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/durar.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c61c36253da---23866389364.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/94423431785.pdfIn PDF document text
    • http://domgr11.ru/uploads/files/gowoliteje.pdfIn PDF document text
    • https://teamcode.net/upload/files/66437827382.pdfIn PDF document text
    • http://gwhs79.com/clients/867100/File/27661452053.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/86rkp91q6199v1d9horvhkqdpe/88498035491.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/71758499621.pdfIn PDF document text
    • https://digireg.pl/upload/vitezaludisarake.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2e66cef13---58185061925.pdfIn PDF document text
    • https://robertbah.si/files/file/35993830120.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c4df126d4---buwerovosawapavolatomu.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/b9ae88922f4429f7e0b23ff41967951d/86503115847.pdfIn PDF document text
    • https://bleikss.com/userfiles/file/82945831063.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ba23a95d653---70685527480.pdfIn PDF document text
    • http://geodez.com/pliki/file/kotapiz.pdfIn PDF document text
    • http://www.centralperdana.com/file/gabagatexajunigare.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/sle755ac6g0pvs23ruta2an5i0/mikezusexorezilimed.pdfIn PDF document text
    • http://saydersan.com/firma/files/29163080293.pdfIn PDF document text
    • http://bumsnab.ru/uploads/files/5575826021.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=discord+id+number+meaningPDF 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_off0000ec94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC94 16908 bytes
SHA-256: 117d2355fba4974e45483d5cca079abbedd193bf805eb7468e9641c4281b6a07
font_01_sfnt_off00011855.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11855 10812 bytes
SHA-256: 538e3eb88dfabb0d421822584d1d7b2d0bf419c91c27993845cb9df4f21f8191
font_02_sfnt_off000130ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1