Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1f9011b7ef9354b…

MALICIOUS

PDF

71.1 KB Created: 2021-09-28 07:17:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f205d12782fb2151221b100a355e0838 SHA-1: 43aafdf6d10c8ab7f8590e6f520e2a1086f7d158 SHA-256: a1f9011b7ef9354b1f07a0b3ff261354e3b129ce4bb65efb1a24e525828cd8af
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The presence of embedded JavaScript and numerous URLs, many pointing to compromised CMS uploads or disposable hosting, strongly indicates a phishing or malware distribution scheme. The ClamAV detection and ML classifier further support its malicious nature. The embedded JavaScript likely attempts to exploit vulnerabilities or redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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 http://hzdsbg.com/uploadfile/1630959613.pdf In PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/l1nu2o3e59nm04i2fjuvuqi6he/zazeninixogeb.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1614cdd98a3353---33096845746.pdfIn PDF document text
    • https://prcomponents.com/ckfinder/userfiles/files/gojotuwatanuse.pdfIn PDF document text
    • http://gs-metals.com/filespath/files/20210903215130.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/74183872360.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/jiwejul.pdfIn PDF document text
    • https://vibingvibes.com/userfiles/files/fotiwu.pdfIn PDF document text
    • http://nemochem.cn/upload/files/51679408124.pdfIn PDF document text
    • http://morpheus-architects.com/file_media/file_image/file/daduz.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/22622650616.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/161506b812cfb0---55123307554.pdfIn PDF document text
    • http://suchanekstomatolog.pl/files/file/jakivimodatanatipidikudum.pdfIn PDF document text
    • https://livbiopharma.com/userfiles/file/25624450605.pdfIn PDF document text
    • https://yumasri.com/assets/ckfinder/userfiles/files/riwiremonemazuligopifemor.pdfIn PDF document text
    • https://karlholmbygg.se/UserFiles/files/notegeveneta.pdfIn PDF document text
    • https://podereilmontaleo.it/writable/public/userfiles/file/14939975402.pdfIn PDF document text
    • http://gildiamasterov.ru/userfiles/file/31838236699.pdfIn PDF document text
    • http://meta-min.com/files/19537201129.pdfIn PDF document text
    • https://chachachat.info/js/ckfinder/userfiles/files/36917819225.pdfIn PDF document text
    • https://haidangpc.com/contents/files/lebupolajinibe.pdfIn PDF document text
    • https://delaneyllc.cfonewsletter.com/ckfinder/userfiles/files/nimew.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/miwaj.pdfIn PDF document text
    • http://shiraz.sk/ckfinder/userfiles/files/zonibumetebimivuwulamulik.pdfIn PDF document text
    • https://citytrafik.nu/images/file/sediwomitulukudedovi.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/wewuvutoni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=descargar+musica+en+tu+androidPDF 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_off0000b59e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB59E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cdb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDB5 10768 bytes
SHA-256: 067b9cf6cf899e47a5be1c86befbb973d142ca91d1db6b6b7a21bf10183cce18
font_02_sfnt_off0000e64e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE64E 15996 bytes
SHA-256: 79e6f1185461007c2d06d64b8843e471aa55785572cdf43a9bfc258a4e4c0726

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