Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd28507b196929fb…

MALICIOUS

PDF

81.5 KB Created: 2021-09-07 21:48:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 40cce95d1175493f17b140fd7a10a8cc SHA-1: 6f71abfeed69c9df8e473d34679ed231dcd656f9 SHA-256: dd28507b196929fb16a132e93411b595f7ade4bdafc9c347deb91799029a0b39
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to potentially compromised or disposable hosting, suggesting a phishing or malware distribution scheme. The document body was unreadable, but the presence of numerous external links and the overall structure strongly suggest a lure to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://jucal.es/images/file/juvozazekomamaroraletax.pdf In PDF document text
    • https://kudamatsu.org/userfiles/file/keselinobawudifelevirowu.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/9347133786.pdfIn PDF document text
    • http://handsonmontessoripk.com/userfiles/files/19811825386.pdfIn PDF document text
    • http://teacherandtraining.com/coj_u/KK/userfiles/files/rasanilizetipop.pdfIn PDF document text
    • http://rspon.pl/images/wyswig_images/file/40359128369.pdfIn PDF document text
    • http://newo.ru/files/files/24440572813.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160c67df605f85---dejosorivevoxekepe.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/81922683405.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607800c864a42---68187167375.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132729f1d1a7---60865336605.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd76918599---memidekevozopan.pdfIn PDF document text
    • https://olivier-daulte.com/ckfinder/userfiles/files/34173671769.pdfIn PDF document text
    • https://ipssecurityconsultants.com/ckfinder/userfiles/files/tubos.pdfIn PDF document text
    • https://dcimx.com/files/2600122713.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d02764fe5f---perij.pdfIn PDF document text
    • http://noithatsah.com/webroot/img/files/59861995502.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/70546308994.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e4358a2a90d---fabonozewu.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/3627364380.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/62134255fcabc6af1b6183fab8ddbdc7/15460634104.pdfIn PDF document text
    • http://status-go.net/gfx/userfiles/files/kukodevasixekukasubugan.pdfIn PDF document text
    • http://maytinhtuyenquang.com/home/maytinhtuy/domains/maytinhtuyenquang.com/public_html/images/file/9722458293.pdfIn PDF document text
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/0a654e9e94b3a56110464da31869b21c/84581662352.pdfIn PDF document text
    • https://attackworkoutprogram.com/app/webroot/files/ckfinder/userfiles/files/76849291966.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=manualidades+con+material+reciclado+plasticoPDF 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_off0000ded5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED5 10768 bytes
SHA-256: 7d707467a7be2c15afe21e7cae480ecc2b172d3e9d5f8f7f03a58ca997b366e6
font_01_sfnt_off0000f784.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF784 15800 bytes
SHA-256: ad06a87075f31ff5f0e202ca034b04097350093d8e4aac887c4455f2ba11e400
font_02_sfnt_off00011fc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1