Malicious PDF — malware analysis report

Static analysis result for SHA-256 a94b48165e5f3f2d…

MALICIOUS

PDF

71.4 KB Created: 2021-09-24 15:52:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: eeb3965c03528a98b2b348beca7477ef SHA-1: 8ee7d49686b1e888b4738792fec4521afe708442 SHA-256: a94b48165e5f3f2d0105ca9fbb7e069b203ae61703e50c1ef4b7d17ec6df2182
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ispartaorganizasyon.com/ckfinder/upload/files/dekorozanijaji.pdf In PDF document text
    • http://mediasingrid.com/js/new/fckeditor/userfiles/file/mijazukovekakirasuvasenol.pdfIn PDF document text
    • http://dalhousieretreat.com/cote_dor_import/admin/ckfinder/userfiles/files/2734685282.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/35b3c23984d29d4cf86bfdd474236e36/tasorenodojil.pdfIn PDF document text
    • https://asztromiskolc.hu/ckfinder/userfiles/files/sexakuxur.pdfIn PDF document text
    • http://www.trisad.kz/ckfinder/userfiles/files/79622279130.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/kd5g62rbj6932miiscpl9gp7j5/94300047244.pdfIn PDF document text
    • https://kolbandibileklik.com/resimler/files/60901587243.pdfIn PDF document text
    • https://suacuachuyennghiep.com/uploads/files/nidobo.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/f79d8214797fe8f6a6b615db2cd89195/9441125329.pdfIn PDF document text
    • https://8cj2aja7-8mxb.com/contents/files/xexababibagapuminad.pdfIn PDF document text
    • http://ukrfirework.com/images/file/fevigutukor.pdfIn PDF document text
    • https://fallahi-sch.com/userfiles/file/40191271316.pdfIn PDF document text
    • http://konstruktor33.ru/app/webroot/files/files/wosetomeg.pdfIn PDF document text
    • http://szyoujin.com/UploadFile/file/20210911190542050.pdfIn PDF document text
    • http://gasthaus-steinkirchen.de/img/editor/file/85167845958.pdfIn PDF document text
    • http://soloparamideco.com/js/new/fckeditor/userfiles/file/gumiloke.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/95747543122.pdfIn PDF document text
    • http://naturestuff.nl/siteimages/file/44323693578.pdfIn PDF document text
    • https://simondaulte.com/ckfinder/userfiles/files/1870004710.pdfIn PDF document text
    • https://yodishit.com/uploads/userfiles/file/fimotolaxebunamogubazi.pdfIn PDF document text
    • https://ferropula.hr/files/mawatigumewapurodadud.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/d10bbed67139f56ca874f252fd4cce9c/jujefesufofufepofu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=hp+reveal+apkPDF 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_off0000b222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB222 18484 bytes
SHA-256: 58eaa21d3a6178ac7b632b2674fee23ffce8919148df2599e49b180f62a364de
font_01_sfnt_off0000e144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE144 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f95a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF95A 9812 bytes
SHA-256: a3bafcf8b48c648989130f5afbca9c78d6e509fc08840abf471782f2da63b857