Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0bb496c7d16371d…

MALICIOUS

PDF

79.0 KB Created: 2021-09-08 02:13:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1fd4c8bdd22bc4d28cf5b6c25fb1d62d SHA-1: 101eda049119a3bcfab097321f011725845347c1 SHA-256: c0bb496c7d16371db03a4031a1cb463374bf26e9e92b148f26c0dfb1227585cd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample is a PDF file that contains embedded JavaScript, which is a common technique for executing malicious code. The PDF also features a large number of external links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to distribute malware or lead to phishing pages. ClamAV detection and ML classification strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. 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 http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6aab81f305---kasojewametabalaz.pdf In PDF document text
    • http://franzoesischebulldoggen.eu/userfiles/file/dutopelumilupenu.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16070b4794ec0e---bazusapetofeg.pdfIn PDF document text
    • http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/39431679237.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/90698955149.pdfIn PDF document text
    • https://serka.com/serka/upload/files/duwux.pdfIn PDF document text
    • http://nsk-nalogov.net/upload/files/juwagitus.pdfIn PDF document text
    • http://freeski.hu/freeski/file/64642196474.pdfIn PDF document text
    • https://artbynela.com/uploads/file/7388100562.pdfIn PDF document text
    • http://huerural.com/uploads/image/files/fefozaxo.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/4190e0940987f055515eb8fe1438a752/51397127578.pdfIn PDF document text
    • https://malabarmail.com/ckfinder/userfiles/files/bomuneritodaravew.pdfIn PDF document text
    • http://unesco-mediain.cz/fckfiles/file/sapalojodirokejojuko.pdfIn PDF document text
    • http://lisaarkin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sudosolibegitebewisiva.pdfIn PDF document text
    • http://ekogamma.pl/javascript/ckfinder/userfiles/files/burovak.pdfIn PDF document text
    • http://jncs.kr/page_data/file/20210531034232.pdfIn PDF document text
    • http://cobansut.com/userfiles/file/36035295721.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/59692404582.pdfIn PDF document text
    • http://www.specemc.ru/upload/files/1949290046.pdfIn PDF document text
    • https://petandpuppies.com/userfiles/file/gebefawexisawosirubutab.pdfIn PDF document text
    • https://mwasafat.com/uploads/files/92544944820.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/birutixikutatovitozuzu.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/cc4hujkja9qkc8368isfje27e5/vafikekexu.pdfIn PDF document text
    • http://neurooperations.com/ckfinder/userfiles/files/54572702131.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=4+stroke+diesel+engine+pdf+downloadPDF 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_off0000cd86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD86 10832 bytes
SHA-256: de946beb6bb76d4b1ec7be533487807f9b04695a30f357c1a4e926cee00d4cff
font_01_sfnt_off0000e680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE680 18536 bytes
SHA-256: f83a052d48e31e7dc6cc93f495c6ad1f98b9113c234c919180083d7c3c20a612
font_02_sfnt_off0001167b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1167B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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