Malicious PDF — malware analysis report

Static analysis result for SHA-256 c97329fd0ac3800e…

MALICIOUS

PDF

73.1 KB Created: 2021-09-13 01:02:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d2701b909d9b68bdfc11632f5e378c7b SHA-1: 06020fa4dafa905e7b6cc9b45e20a96396f7fb50 SHA-256: c97329fd0ac3800e97d4ffdd87a1bda46bb61a5f640b9f17504243ff92185ee0
164 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and numerous external links, many of which point to compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript and link farm suggest an attempt to redirect the user to malicious content or download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 7

  • 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.
  • 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://vico-inmobiliaria.com/ckfinder/userfiles/files/38810672421.pdf In PDF document text
    • http://sdv.sk/userfiles/articles/file/zeliropeti.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136121703ada---70174102973.pdfIn PDF document text
    • https://fundacionamigosdelmarcaribe.ong/ckfinder/userfiles/files/jegikutunusonivikugofek.pdfIn PDF document text
    • http://live-net.it/file/90566124574.pdfIn PDF document text
    • http://perechen-izdaniy.ru/js/ckfinder/userfiles/files/sezuwaz.pdfIn PDF document text
    • http://mawaevents.com/uploads/file/93106086950.pdfIn PDF document text
    • https://sausalito.com/wysiwygfiles/file/36915158883.pdfIn PDF document text
    • http://bsa.by/ckfinder/userfiles/files/sinage.pdfIn PDF document text
    • http://abwjefferson.com/uploads/files/9261020382.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d032ecb05f---vuxijafonejogukijasame.pdfIn PDF document text
    • http://chinhsuasolieu.com/media/files/kezowuri.pdfIn PDF document text
    • http://tovicetour.com/FileData/ckfinder/files/20210901_592BCF7BEE804923.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/59953697905.pdfIn PDF document text
    • https://kimcert.com/E/file/49277062863.pdfIn PDF document text
    • https://kildevangen.dk/files/14572365673.pdfIn PDF document text
    • http://myshiou.com/uploads/files/202109040106349186.pdfIn PDF document text
    • http://www.fuchingrading.com/upload/file/dukurozasebefeku.pdfIn PDF document text
    • http://delfosventures.eu/userfiles/files/lorajulasotodogosi.pdfIn PDF document text
    • https://smartbrand.ro/mm/file/9101981477.pdfIn PDF document text
    • https://nexusmediation.nl/files/dozutitel.pdfIn PDF document text
    • https://grupo.iberia.es/js/ckfinder/userfiles/files/nekikagotorisudaxitomere.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/rkj7hfcjb40n4cb3vv2gfj3qlu/99793147318.pdfIn PDF document text
    • http://tovicetour.com/FileData/ckfinder/files/20210911_422288D42DAF3C4A.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/jepadopim.pdfIn PDF document text
    • http://obkladlazby.cz/userfiles/file/34736631834.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=domestika+premium+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_off0000b99b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB99B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d1ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1AD 17644 bytes
SHA-256: 53837fec83fa1b9dd2a6f6af523ab5fbec36e5a4095baf087f05eb1115d00998
font_02_sfnt_off0000ff09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF09 10456 bytes
SHA-256: 5cabc133f6d9d0822f7f226d4790cdc12afa02cf4da80af210dfcaeaf3d48f05

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