Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a064ab7c913a96d…

MALICIOUS

PDF

86.2 KB Created: 2021-08-23 10:30:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2e7e489beb067b70a03e9050a522127e SHA-1: 8294ee839b0e139eb537aa2895581906acb2c203 SHA-256: 1a064ab7c913a96dc2e79466bfe8a49045a672a5ca51b536acda214af09aa41c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites hosting other PDF files, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://altstudio.be/app/webroot/uploads/file/93528599286.pdf In PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160abc265e224e---dojexejofobum.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb142288e3---92359208653.pdfIn PDF document text
    • https://butterfly-propertymanagement.com/userfiles/file/xiripapisuxetiloboxawide.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607200cfecb0e---beluvufijedetutomomepido.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/xoren.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ca3a5b12c90---tadopuvi.pdfIn PDF document text
    • http://d4storonto.com/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/wobepe.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/93c5c5928d0a66826a7e163ee95a11f6/bawelenetodivivut.pdfIn PDF document text
    • http://xinyaoqiye.com/upload_fck/file/2021-7-17/20210717084831136597.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/c2c1pj22i4liv8a9acnahu3ti4/fegitikujasub.pdfIn PDF document text
    • https://ferdavagnar.is/images/fck/file/96263914423.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160798d396613b---36901388169.pdfIn PDF document text
    • http://ekachaiguitarist.com/ckfinder/userfiles/files/pelozujuja.pdfIn PDF document text
    • http://nwatchonline.org/userfiles/file/savamoledudimoz.pdfIn PDF document text
    • http://sjzhtchem.com/upload/files/wopizoxozogifa.pdfIn PDF document text
    • https://tvsporedi.si/vsebina/54988740410.pdfIn PDF document text
    • http://stressmanagement-karriere.de/userfiles/file/vexup.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/10056912279.pdfIn PDF document text
    • http://sam-global.info/files/file/zofese.pdfIn PDF document text
    • http://sbstroy53.ru/img/files/bafexakimanigev.pdfIn PDF document text
    • http://tao123.me/pro_pic/files/42756200996.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c77b8f722bf---33334233222.pdfIn PDF document text
    • http://faradbox.pl/files/file/84305874565.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=cars+run+on+gas+and+electricityPDF 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_off0000eb94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB94 10788 bytes
SHA-256: 3fb66cfcc0379d247899e903344332d15dd478d6c4fab9bc3bf5916237fb1471
font_01_sfnt_off0001045e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1045E 17228 bytes
SHA-256: e2493ed739a7eec92bc1f17b8946dbcbfa255ee3c9881f625cc3af91bb6ff86f
font_02_sfnt_off00013159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13159 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1